diff --git a/app/src/main/assets/updateLog.md b/app/src/main/assets/updateLog.md
index 2d01b7c58..e38e525d7 100644
--- a/app/src/main/assets/updateLog.md
+++ b/app/src/main/assets/updateLog.md
@@ -1,8 +1,14 @@
 ## 更新日志
 
 * 旧版数据导入教程：
-* 先在旧版阅读(2.x)中进行备份，然后在新版阅读(3.x)【我的】->【备份与恢复】，选择【导入旧版本数据】，提示存储权限，选择允许即可导入成功。
-* 注意：由于安卓10更改了权限策略，还需要给「允许安装其他应用」的权限才能导入源。MIUI11也需要此权限。
+* 先在旧版阅读(2.x)中进行备份，然后在新版阅读(3.x)【我的】->【备份与恢复】，选择【导入旧版本数据】。
+
+**2020/01/07**
+* 修复备份问题
+
+**2020/01/06**
+* 适配Android 10 权限
+* 备份恢复不再需要存储权限
 
 **2020/01/03**
 * 适配Android 10 权限
diff --git a/app/src/main/java/io/legado/app/data/AppDatabase.kt b/app/src/main/java/io/legado/app/data/AppDatabase.kt
index cab698fbd..d65b43ada 100644
--- a/app/src/main/java/io/legado/app/data/AppDatabase.kt
+++ b/app/src/main/java/io/legado/app/data/AppDatabase.kt
@@ -7,7 +7,10 @@ import androidx.room.RoomDatabase
 import androidx.sqlite.db.SupportSQLiteDatabase
 import io.legado.app.data.dao.*
 import io.legado.app.data.entities.*
+import io.legado.app.help.storage.Backup
 import io.legado.app.help.storage.Restore
+import kotlinx.coroutines.GlobalScope
+import kotlinx.coroutines.launch
 
 
 @Database(
@@ -28,7 +31,7 @@ abstract class AppDatabase : RoomDatabase() {
                 .fallbackToDestructiveMigration()
                 .addCallback(object : Callback() {
                     override fun onDestructiveMigration(db: SupportSQLiteDatabase) {
-                        Restore.restore()
+                        GlobalScope.launch { Restore.restore(Backup.backupPath) }
                     }
                 })
                 .build()
diff --git a/app/src/main/java/io/legado/app/help/storage/Backup.kt b/app/src/main/java/io/legado/app/help/storage/Backup.kt
index 3f8e65dd7..90bf3b9e2 100644
--- a/app/src/main/java/io/legado/app/help/storage/Backup.kt
+++ b/app/src/main/java/io/legado/app/help/storage/Backup.kt
@@ -9,13 +9,15 @@ import io.legado.app.help.ReadBookConfig
 import io.legado.app.utils.DocumentUtils
 import io.legado.app.utils.FileUtils
 import io.legado.app.utils.GSON
+import kotlinx.coroutines.Dispatchers.IO
+import kotlinx.coroutines.withContext
 import org.jetbrains.anko.defaultSharedPreferences
 import java.io.File
 
 
 object Backup {
 
-    private val backupPath = App.INSTANCE.filesDir.absolutePath + File.separator + "backup"
+    val backupPath = App.INSTANCE.filesDir.absolutePath + File.separator + "backup"
 
     val defaultPath by lazy {
         FileUtils.getSdCardPath() + File.separator + "YueDu"
@@ -29,7 +31,7 @@ object Backup {
         legadoPath + File.separator + "Export"
     }
 
-    private val backupFileNames by lazy {
+    val backupFileNames by lazy {
         arrayOf(
             "bookshelf.json",
             "bookGroup.json",
@@ -41,67 +43,72 @@ object Backup {
         )
     }
 
-    fun backup(context: Context, uri: Uri?) {
-        App.db.bookDao().allBooks.let {
-            if (it.isNotEmpty()) {
-                val json = GSON.toJson(it)
-                FileHelp.getFile(backupPath + File.separator + "bookshelf.json").writeText(json)
+    suspend fun backup(context: Context, uri: Uri?) {
+        withContext(IO) {
+            App.db.bookDao().allBooks.let {
+                if (it.isNotEmpty()) {
+                    val json = GSON.toJson(it)
+                    FileHelp.getFile(backupPath + File.separator + "bookshelf.json").writeText(json)
+                }
             }
-        }
-        App.db.bookGroupDao().all().let {
-            if (it.isNotEmpty()) {
-                val json = GSON.toJson(it)
-                FileHelp.getFile(backupPath + File.separator + "bookGroup.json").writeText(json)
+            App.db.bookGroupDao().all().let {
+                if (it.isNotEmpty()) {
+                    val json = GSON.toJson(it)
+                    FileHelp.getFile(backupPath + File.separator + "bookGroup.json").writeText(json)
+                }
             }
-        }
-        App.db.bookSourceDao().all.let {
-            if (it.isNotEmpty()) {
-                val json = GSON.toJson(it)
-                FileHelp.getFile(backupPath + File.separator + "bookSource.json").writeText(json)
+            App.db.bookSourceDao().all.let {
+                if (it.isNotEmpty()) {
+                    val json = GSON.toJson(it)
+                    FileHelp.getFile(backupPath + File.separator + "bookSource.json")
+                        .writeText(json)
+                }
             }
-        }
-        App.db.rssSourceDao().all.let {
-            if (it.isNotEmpty()) {
-                val json = GSON.toJson(it)
-                FileHelp.getFile(backupPath + File.separator + "rssSource.json").writeText(json)
+            App.db.rssSourceDao().all.let {
+                if (it.isNotEmpty()) {
+                    val json = GSON.toJson(it)
+                    FileHelp.getFile(backupPath + File.separator + "rssSource.json").writeText(json)
+                }
             }
-        }
-        App.db.replaceRuleDao().all.let {
-            if (it.isNotEmpty()) {
-                val json = GSON.toJson(it)
-                FileHelp.getFile(backupPath + File.separator + "replaceRule.json").writeText(json)
+            App.db.replaceRuleDao().all.let {
+                if (it.isNotEmpty()) {
+                    val json = GSON.toJson(it)
+                    FileHelp.getFile(backupPath + File.separator + "replaceRule.json")
+                        .writeText(json)
+                }
             }
-        }
-        GSON.toJson(ReadBookConfig.configList)?.let {
-            FileHelp.getFile(backupPath + File.separator + ReadBookConfig.readConfigFileName)
-                .writeText(it)
-        }
-        Preferences.getSharedPreferences(App.INSTANCE, backupPath, "config")?.let { sp ->
-            val edit = sp.edit()
-            App.INSTANCE.defaultSharedPreferences.all.map {
-                when (val value = it.value) {
-                    is Int -> edit.putInt(it.key, value)
-                    is Boolean -> edit.putBoolean(it.key, value)
-                    is Long -> edit.putLong(it.key, value)
-                    is Float -> edit.putFloat(it.key, value)
-                    is String -> edit.putString(it.key, value)
-                    else -> Unit
+            GSON.toJson(ReadBookConfig.configList)?.let {
+                FileHelp.getFile(backupPath + File.separator + ReadBookConfig.readConfigFileName)
+                    .writeText(it)
+            }
+            Preferences.getSharedPreferences(App.INSTANCE, backupPath, "config")?.let { sp ->
+                val edit = sp.edit()
+                App.INSTANCE.defaultSharedPreferences.all.map {
+                    when (val value = it.value) {
+                        is Int -> edit.putInt(it.key, value)
+                        is Boolean -> edit.putBoolean(it.key, value)
+                        is Long -> edit.putLong(it.key, value)
+                        is Float -> edit.putFloat(it.key, value)
+                        is String -> edit.putString(it.key, value)
+                        else -> Unit
+                    }
                 }
+                edit.commit()
+            }
+            WebDavHelp.backUpWebDav(backupPath)
+            if (uri != null) {
+                copyBackup(context, uri)
+            } else {
+                copyBackup()
             }
-            edit.commit()
-        }
-        WebDavHelp.backUpWebDav(backupPath)
-        if (uri != null) {
-            copyBackup(context, uri)
-        } else {
-            copyBackup()
         }
     }
 
     private fun copyBackup(context: Context, uri: Uri) {
         DocumentFile.fromTreeUri(context, uri)?.let { treeDoc ->
             for (fileName in backupFileNames) {
-                treeDoc.createFile("text/plain", fileName)?.let { doc ->
+                val doc = treeDoc.findFile(fileName) ?: treeDoc.createFile("", fileName)
+                doc?.let {
                     DocumentUtils.writeText(
                         context,
                         FileHelp.getFile(backupPath + File.separator + fileName).readText(),
@@ -113,9 +120,13 @@ object Backup {
     }
 
     private fun copyBackup() {
-        for (fileName in backupFileNames) {
-            FileHelp.getFile(backupPath + File.separator + "bookshelf.json")
-                .copyTo(FileHelp.getFile(legadoPath + File.separator + "bookshelf.json"))
+        try {
+            for (fileName in backupFileNames) {
+                FileHelp.getFile(backupPath + File.separator + "bookshelf.json")
+                    .copyTo(FileHelp.getFile(legadoPath + File.separator + "bookshelf.json"), true)
+            }
+        } catch (e: Exception) {
+            e.printStackTrace()
         }
     }
 }
\ No newline at end of file
diff --git a/app/src/main/java/io/legado/app/help/storage/Restore.kt b/app/src/main/java/io/legado/app/help/storage/Restore.kt
index 116419a63..a95626228 100644
--- a/app/src/main/java/io/legado/app/help/storage/Restore.kt
+++ b/app/src/main/java/io/legado/app/help/storage/Restore.kt
@@ -1,13 +1,14 @@
 package io.legado.app.help.storage
 
 import android.content.Context
+import android.net.Uri
 import android.util.Log
+import androidx.documentfile.provider.DocumentFile
 import com.jayway.jsonpath.Configuration
 import com.jayway.jsonpath.JsonPath
 import com.jayway.jsonpath.Option
 import com.jayway.jsonpath.ParseContext
 import io.legado.app.App
-import io.legado.app.R
 import io.legado.app.constant.AppConst
 import io.legado.app.data.entities.*
 import io.legado.app.help.FileHelp
@@ -19,9 +20,7 @@ import kotlinx.coroutines.GlobalScope
 import kotlinx.coroutines.launch
 import kotlinx.coroutines.withContext
 import org.jetbrains.anko.defaultSharedPreferences
-import org.jetbrains.anko.doAsync
 import org.jetbrains.anko.toast
-import org.jetbrains.anko.uiThread
 import java.io.File
 
 object Restore {
@@ -33,8 +32,24 @@ object Restore {
         )
     }
 
-    fun restore(path: String = Backup.defaultPath) {
-        doAsync {
+    suspend fun restore(context: Context, uri: Uri) {
+        withContext(IO) {
+            DocumentFile.fromTreeUri(context, uri)?.listFiles()?.forEach { doc ->
+                for (fileName in Backup.backupFileNames) {
+                    if (doc.name == fileName) {
+                        DocumentUtils.readText(context, doc.uri)?.let {
+                            FileHelp.getFile(Backup.backupPath + File.separator + fileName)
+                                .writeText(it)
+                        }
+                    }
+                }
+            }
+        }
+        restore(Backup.backupPath)
+    }
+
+    suspend fun restore(path: String) {
+        withContext(IO) {
             try {
                 val file = FileHelp.getFile(path + File.separator + "bookshelf.json")
                 val json = file.readText()
@@ -104,7 +119,6 @@ object Restore {
                 }
                 edit.commit()
             }
-            uiThread { App.INSTANCE.toast(R.string.restore_success) }
         }
     }
 
diff --git a/app/src/main/java/io/legado/app/help/storage/WebDavHelp.kt b/app/src/main/java/io/legado/app/help/storage/WebDavHelp.kt
index a4ac7fbcc..4a0f3e152 100644
--- a/app/src/main/java/io/legado/app/help/storage/WebDavHelp.kt
+++ b/app/src/main/java/io/legado/app/help/storage/WebDavHelp.kt
@@ -4,13 +4,14 @@ import android.content.Context
 import io.legado.app.App
 import io.legado.app.help.FileHelp
 import io.legado.app.help.ReadBookConfig
+import io.legado.app.help.coroutine.Coroutine
 import io.legado.app.lib.webdav.WebDav
 import io.legado.app.lib.webdav.http.HttpAuth
 import io.legado.app.utils.ZipUtils
 import io.legado.app.utils.getPrefString
-import org.jetbrains.anko.doAsync
+import kotlinx.coroutines.Dispatchers.IO
+import kotlinx.coroutines.withContext
 import org.jetbrains.anko.selector
-import org.jetbrains.anko.uiThread
 import java.io.File
 import java.text.SimpleDateFormat
 import java.util.*
@@ -54,28 +55,26 @@ object WebDavHelp {
         return names
     }
 
-    fun showRestoreDialog(context: Context) {
-        doAsync {
-            val names = getWebDavFileNames()
-            if (names.isNotEmpty()) {
-                uiThread {
-                    context.selector(title = "选择恢复文件", items = names) { _, index ->
-                        if (index in 0 until names.size) {
-                            restoreWebDav(names[index])
-                        }
-                    }
+    suspend fun showRestoreDialog(context: Context): Boolean {
+        val names = withContext(IO) { getWebDavFileNames() }
+        return if (names.isNotEmpty()) {
+            context.selector(title = "选择恢复文件", items = names) { _, index ->
+                if (index in 0 until names.size) {
+                    restoreWebDav(names[index])
                 }
-            } else {
-                Restore.restore()
             }
+            true
+        } else {
+            false
         }
     }
 
     private fun restoreWebDav(name: String) {
-        doAsync {
+        Coroutine.async {
             getWebDavUrl()?.let {
                 val file = WebDav(it + "legado/" + name)
                 file.downloadTo(zipFilePath, true)
+                @Suppress("BlockingMethodInNonBlockingContext")
                 ZipUtils.unzipFile(zipFilePath, unzipFilesPath)
                 Restore.restore(unzipFilesPath)
             }
diff --git a/app/src/main/java/io/legado/app/ui/book/read/page/ContentView.kt b/app/src/main/java/io/legado/app/ui/book/read/page/ContentView.kt
index 903cc3abc..cc9e9e666 100644
--- a/app/src/main/java/io/legado/app/ui/book/read/page/ContentView.kt
+++ b/app/src/main/java/io/legado/app/ui/book/read/page/ContentView.kt
@@ -17,6 +17,7 @@ import io.legado.app.utils.*
 import kotlinx.android.synthetic.main.view_book_page.view.*
 import org.jetbrains.anko.matchParent
 import org.jetbrains.anko.sdk27.listeners.onScrollChange
+import java.io.File
 import java.util.*
 
 
@@ -83,10 +84,15 @@ class ContentView : FrameLayout {
         }
         context.getPrefString(PreferKey.readBookFont)?.let {
             if (it.isNotEmpty()) {
-                content_text_view.typeface = Typeface.createFromFile(it)
-            } else {
-                content_text_view.typeface = Typeface.DEFAULT
+                val file = File(it)
+                if (file.exists()) {
+                    content_text_view.typeface = Typeface.createFromFile(it)
+                    return@let
+                } else {
+                    context.putPrefString(PreferKey.readBookFont, "")
+                }
             }
+            content_text_view.typeface = Typeface.DEFAULT
         }
     }
 
diff --git a/app/src/main/java/io/legado/app/ui/config/WebDavConfigFragment.kt b/app/src/main/java/io/legado/app/ui/config/WebDavConfigFragment.kt
index 4dea5e0e7..446c93f68 100644
--- a/app/src/main/java/io/legado/app/ui/config/WebDavConfigFragment.kt
+++ b/app/src/main/java/io/legado/app/ui/config/WebDavConfigFragment.kt
@@ -34,10 +34,10 @@ import kotlin.coroutines.CoroutineContext
 class WebDavConfigFragment : PreferenceFragmentCompat(),
     Preference.OnPreferenceChangeListener,
     CoroutineScope {
-    lateinit var job: Job
-    private val oldDataRequestCode = 23156
-    private val backupSelectRequestCode = 4567489
-    private val restoreSelectRequestCode = 654872
+    private lateinit var job: Job
+    private val oldDataRequestCode = 11
+    private val backupSelectRequestCode = 22
+    private val restoreSelectRequestCode = 33
 
     override val coroutineContext: CoroutineContext
         get() = job + Dispatchers.Main
@@ -116,13 +116,7 @@ class WebDavConfigFragment : PreferenceFragmentCompat(),
     override fun onPreferenceTreeClick(preference: Preference?): Boolean {
         when (preference?.key) {
             "web_dav_backup" -> backup()
-            "web_dav_restore" -> PermissionsCompat.Builder(this)
-                .addPermissions(*Permissions.Group.STORAGE)
-                .rationale(R.string.tip_perm_request_storage)
-                .onGranted {
-                    WebDavHelp.showRestoreDialog(requireContext())
-                }
-                .request()
+            "web_dav_restore" -> restore()
             "import_old" -> importOldData()
         }
         return super.onPreferenceTreeClick(preference)
@@ -130,16 +124,18 @@ class WebDavConfigFragment : PreferenceFragmentCompat(),
 
     private fun backup() {
         val backupPath = getPrefString(PreferKey.backupPath)
-        if (backupPath?.isEmpty() == true) {
-            selectBackupFolder()
-        } else {
+        if (backupPath?.isNotEmpty() == true) {
             val uri = Uri.parse(backupPath)
             val doc = DocumentFile.fromTreeUri(requireContext(), uri)
             if (doc?.canWrite() == true) {
-                Backup.backup(requireContext(), uri)
+                launch {
+                    Backup.backup(requireContext(), uri)
+                }
             } else {
                 selectBackupFolder()
             }
+        } else {
+            selectBackupFolder()
         }
     }
 
@@ -152,7 +148,50 @@ class WebDavConfigFragment : PreferenceFragmentCompat(),
             PermissionsCompat.Builder(this)
                 .addPermissions(*Permissions.Group.STORAGE)
                 .rationale(R.string.tip_perm_request_storage)
-                .onGranted { Backup.backup(requireContext(), null) }
+                .onGranted {
+                    launch {
+                        Backup.backup(requireContext(), null)
+                    }
+                }
+                .request()
+        }
+    }
+
+    fun restore() {
+        launch {
+            if (!WebDavHelp.showRestoreDialog(requireContext())) {
+                val backupPath = getPrefString(PreferKey.backupPath)
+                if (backupPath?.isNotEmpty() == true) {
+                    val uri = Uri.parse(backupPath)
+                    val doc = DocumentFile.fromTreeUri(requireContext(), uri)
+                    if (doc?.canWrite() == true) {
+                        Restore.restore(requireContext(), uri)
+                        toast(R.string.restore_success)
+                    } else {
+                        selectBackupFolder()
+                    }
+                } else {
+                    selectRestoreFolder()
+                }
+            }
+        }
+    }
+
+    private fun selectRestoreFolder() {
+        try {
+            val intent = Intent(Intent.ACTION_OPEN_DOCUMENT_TREE)
+            intent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION)
+            startActivityForResult(intent, restoreSelectRequestCode)
+        } catch (e: java.lang.Exception) {
+            PermissionsCompat.Builder(this)
+                .addPermissions(*Permissions.Group.STORAGE)
+                .rationale(R.string.tip_perm_request_storage)
+                .onGranted {
+                    launch {
+                        Restore.restore(Backup.legadoPath)
+                        toast(R.string.restore_success)
+                    }
+                }
                 .request()
         }
     }
@@ -267,7 +306,22 @@ class WebDavConfigFragment : PreferenceFragmentCompat(),
                         Intent.FLAG_GRANT_READ_URI_PERMISSION or Intent.FLAG_GRANT_WRITE_URI_PERMISSION
                     )
                     putPrefString(PreferKey.backupPath, uri.toString())
-                    Backup.backup(requireContext(), uri)
+                    launch {
+                        Backup.backup(requireContext(), uri)
+                    }
+                }
+            }
+            restoreSelectRequestCode -> if (resultCode == RESULT_OK) {
+                data?.data?.let { uri ->
+                    requireContext().contentResolver.takePersistableUriPermission(
+                        uri,
+                        Intent.FLAG_GRANT_READ_URI_PERMISSION or Intent.FLAG_GRANT_WRITE_URI_PERMISSION
+                    )
+                    putPrefString(PreferKey.backupPath, uri.toString())
+                    launch {
+                        Restore.restore(requireContext(), uri)
+                        toast(R.string.restore_success)
+                    }
                 }
             }
         }
diff --git a/app/src/main/java/io/legado/app/ui/main/MainActivity.kt b/app/src/main/java/io/legado/app/ui/main/MainActivity.kt
index 0a6ca93c1..571b32139 100644
--- a/app/src/main/java/io/legado/app/ui/main/MainActivity.kt
+++ b/app/src/main/java/io/legado/app/ui/main/MainActivity.kt
@@ -1,7 +1,5 @@
 package io.legado.app.ui.main
 
-import android.app.Activity
-import android.content.Intent
 import android.net.Uri
 import android.os.Bundle
 import android.view.KeyEvent
@@ -18,11 +16,7 @@ import io.legado.app.R
 import io.legado.app.base.VMBaseActivity
 import io.legado.app.constant.Bus
 import io.legado.app.constant.PreferKey
-import io.legado.app.help.permission.Permissions
-import io.legado.app.help.permission.PermissionsCompat
 import io.legado.app.help.storage.Backup
-import io.legado.app.help.storage.Restore
-import io.legado.app.help.storage.WebDavHelp
 import io.legado.app.lib.theme.ATH
 import io.legado.app.service.BaseReadAloudService
 import io.legado.app.service.help.ReadAloud
@@ -33,15 +27,11 @@ import io.legado.app.ui.main.my.MyFragment
 import io.legado.app.ui.main.rss.RssFragment
 import io.legado.app.utils.*
 import kotlinx.android.synthetic.main.activity_main.*
-import kotlinx.coroutines.Dispatchers.IO
 import kotlinx.coroutines.launch
-import kotlinx.coroutines.withContext
 
 class MainActivity : VMBaseActivity<MainViewModel>(R.layout.activity_main),
     BottomNavigationView.OnNavigationItemSelectedListener,
     ViewPager.OnPageChangeListener by ViewPager.SimpleOnPageChangeListener() {
-    private val backupSelectRequestCode = 4567489
-    private val restoreSelectRequestCode = 654872
     override val viewModel: MainViewModel
         get() = getViewModel(MainViewModel::class.java)
 
@@ -127,9 +117,7 @@ class MainActivity : VMBaseActivity<MainViewModel>(R.layout.activity_main),
     override fun finish() {
         if (!BuildConfig.DEBUG) {
             launch {
-                withContext(IO) {
-                    backup()
-                }
+                backup()
                 super.finish()
             }
         } else {
@@ -137,6 +125,19 @@ class MainActivity : VMBaseActivity<MainViewModel>(R.layout.activity_main),
         }
     }
 
+    private suspend fun backup() {
+        val backupPath = getPrefString(PreferKey.backupPath)
+        if (backupPath?.isNotEmpty() == true) {
+            val uri = Uri.parse(backupPath)
+            val doc = DocumentFile.fromTreeUri(this, uri)
+            if (doc?.canWrite() == true) {
+                Backup.backup(this@MainActivity, uri)
+            }
+        } else {
+            Backup.backup(this@MainActivity, null)
+        }
+    }
+
     override fun onDestroy() {
         super.onDestroy()
         ReadAloud.stop(this)
@@ -156,86 +157,6 @@ class MainActivity : VMBaseActivity<MainViewModel>(R.layout.activity_main),
         }
     }
 
-    fun backup() {
-        val backupPath = getPrefString(PreferKey.backupPath)
-        if (backupPath?.isEmpty() == true) {
-            selectBackupFolder()
-        } else {
-            val uri = Uri.parse(backupPath)
-            val doc = DocumentFile.fromTreeUri(this, uri)
-            if (doc?.canWrite() == true) {
-                Backup.backup(this, uri)
-            } else {
-                selectBackupFolder()
-            }
-        }
-    }
-
-    fun restore() {
-        PermissionsCompat.Builder(this)
-            .addPermissions(*Permissions.Group.STORAGE)
-            .rationale(R.string.tip_perm_request_storage)
-            .onGranted { WebDavHelp.showRestoreDialog(this) }
-            .request()
-    }
-
-    fun restore(uri: Uri) {
-
-    }
-
-    private fun selectBackupFolder() {
-        try {
-            val intent = Intent(Intent.ACTION_OPEN_DOCUMENT_TREE)
-            intent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION)
-            startActivityForResult(intent, backupSelectRequestCode)
-        } catch (e: java.lang.Exception) {
-            PermissionsCompat.Builder(this)
-                .addPermissions(*Permissions.Group.STORAGE)
-                .rationale(R.string.tip_perm_request_storage)
-                .onGranted { Backup.backup(this, null) }
-                .request()
-        }
-    }
-
-    private fun selectRestoreFolder() {
-        try {
-            val intent = Intent(Intent.ACTION_OPEN_DOCUMENT_TREE)
-            intent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION)
-            startActivityForResult(intent, restoreSelectRequestCode)
-        } catch (e: java.lang.Exception) {
-            PermissionsCompat.Builder(this)
-                .addPermissions(*Permissions.Group.STORAGE)
-                .rationale(R.string.tip_perm_request_storage)
-                .onGranted { Restore.restore() }
-                .request()
-        }
-    }
-
-    override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {
-        super.onActivityResult(requestCode, resultCode, data)
-        when (requestCode) {
-            backupSelectRequestCode -> if (resultCode == Activity.RESULT_OK) {
-                data?.data?.let { uri ->
-                    contentResolver.takePersistableUriPermission(
-                        uri,
-                        Intent.FLAG_GRANT_READ_URI_PERMISSION or Intent.FLAG_GRANT_WRITE_URI_PERMISSION
-                    )
-                    putPrefString(PreferKey.backupPath, uri.toString())
-                    Backup.backup(this, uri)
-                }
-            }
-            restoreSelectRequestCode -> if (resultCode == Activity.RESULT_OK) {
-                data?.data?.let { uri ->
-                    contentResolver.takePersistableUriPermission(
-                        uri,
-                        Intent.FLAG_GRANT_READ_URI_PERMISSION or Intent.FLAG_GRANT_WRITE_URI_PERMISSION
-                    )
-                    putPrefString(PreferKey.backupPath, uri.toString())
-                }
-            }
-        }
-    }
-
     private inner class TabFragmentPageAdapter internal constructor(fm: FragmentManager) :
         FragmentStatePagerAdapter(fm, BEHAVIOR_RESUME_ONLY_CURRENT_FRAGMENT) {
 
diff --git a/app/src/main/java/io/legado/app/ui/main/my/MyFragment.kt b/app/src/main/java/io/legado/app/ui/main/my/MyFragment.kt
index 5b2a24114..6d79f55d4 100644
--- a/app/src/main/java/io/legado/app/ui/main/my/MyFragment.kt
+++ b/app/src/main/java/io/legado/app/ui/main/my/MyFragment.kt
@@ -1,10 +1,14 @@
 package io.legado.app.ui.main.my
 
+import android.app.Activity
+import android.content.Intent
 import android.content.SharedPreferences
+import android.net.Uri
 import android.os.Bundle
 import android.view.Menu
 import android.view.MenuItem
 import android.view.View
+import androidx.documentfile.provider.DocumentFile
 import androidx.preference.Preference
 import androidx.preference.PreferenceFragmentCompat
 import androidx.preference.SwitchPreference
@@ -12,7 +16,13 @@ import io.legado.app.App
 import io.legado.app.R
 import io.legado.app.base.BaseFragment
 import io.legado.app.constant.Bus
+import io.legado.app.constant.PreferKey
 import io.legado.app.help.BookHelp
+import io.legado.app.help.permission.Permissions
+import io.legado.app.help.permission.PermissionsCompat
+import io.legado.app.help.storage.Backup
+import io.legado.app.help.storage.Restore
+import io.legado.app.help.storage.WebDavHelp
 import io.legado.app.lib.theme.ATH
 import io.legado.app.service.WebService
 import io.legado.app.ui.about.AboutActivity
@@ -20,13 +30,15 @@ import io.legado.app.ui.about.DonateActivity
 import io.legado.app.ui.book.source.manage.BookSourceActivity
 import io.legado.app.ui.config.ConfigActivity
 import io.legado.app.ui.config.ConfigViewModel
-import io.legado.app.ui.main.MainActivity
 import io.legado.app.ui.replacerule.ReplaceRuleActivity
 import io.legado.app.utils.*
 import kotlinx.android.synthetic.main.view_title_bar.*
+import kotlinx.coroutines.launch
 import org.jetbrains.anko.startActivity
 
 class MyFragment : BaseFragment(R.layout.fragment_my_config) {
+    private val backupSelectRequestCode = 22
+    private val restoreSelectRequestCode = 33
 
     override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
         setSupportToolbar(toolbar)
@@ -43,13 +55,113 @@ class MyFragment : BaseFragment(R.layout.fragment_my_config) {
     override fun onCompatOptionsItemSelected(item: MenuItem) {
         when (item.itemId) {
             R.id.menu_help -> startActivity<AboutActivity>()
-            R.id.menu_backup -> {
-                val activity = activity as? MainActivity
-                activity?.backup()
+            R.id.menu_backup -> backup()
+            R.id.menu_restore -> restore()
+        }
+    }
+
+
+    private fun backup() {
+        val backupPath = getPrefString(PreferKey.backupPath)
+        if (backupPath?.isNotEmpty() == true) {
+            val uri = Uri.parse(backupPath)
+            val doc = DocumentFile.fromTreeUri(requireContext(), uri)
+            if (doc?.canWrite() == true) {
+                launch {
+                    Backup.backup(requireContext(), uri)
+                }
+            } else {
+                selectBackupFolder()
+            }
+        } else {
+            selectBackupFolder()
+        }
+    }
+
+    private fun selectBackupFolder() {
+        try {
+            val intent = Intent(Intent.ACTION_OPEN_DOCUMENT_TREE)
+            intent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION)
+            startActivityForResult(intent, backupSelectRequestCode)
+        } catch (e: java.lang.Exception) {
+            PermissionsCompat.Builder(this)
+                .addPermissions(*Permissions.Group.STORAGE)
+                .rationale(R.string.tip_perm_request_storage)
+                .onGranted {
+                    launch {
+                        Backup.backup(requireContext(), null)
+                    }
+                }
+                .request()
+        }
+    }
+
+    fun restore() {
+        launch {
+            if (!WebDavHelp.showRestoreDialog(requireContext())) {
+                val backupPath = getPrefString(PreferKey.backupPath)
+                if (backupPath?.isNotEmpty() == true) {
+                    val uri = Uri.parse(backupPath)
+                    val doc = DocumentFile.fromTreeUri(requireContext(), uri)
+                    if (doc?.canWrite() == true) {
+                        Restore.restore(requireContext(), uri)
+                        toast(R.string.restore_success)
+                    } else {
+                        selectBackupFolder()
+                    }
+                } else {
+                    selectRestoreFolder()
+                }
             }
-            R.id.menu_restore -> {
-                val activity = activity as? MainActivity
-                activity?.restore()
+        }
+    }
+
+    private fun selectRestoreFolder() {
+        try {
+            val intent = Intent(Intent.ACTION_OPEN_DOCUMENT_TREE)
+            intent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION)
+            startActivityForResult(intent, restoreSelectRequestCode)
+        } catch (e: java.lang.Exception) {
+            PermissionsCompat.Builder(this)
+                .addPermissions(*Permissions.Group.STORAGE)
+                .rationale(R.string.tip_perm_request_storage)
+                .onGranted {
+                    launch {
+                        Restore.restore(Backup.legadoPath)
+                        toast(R.string.restore_success)
+                    }
+                }
+                .request()
+        }
+    }
+
+    override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {
+        super.onActivityResult(requestCode, resultCode, data)
+        when (requestCode) {
+            backupSelectRequestCode -> if (resultCode == Activity.RESULT_OK) {
+                data?.data?.let { uri ->
+                    requireContext().contentResolver.takePersistableUriPermission(
+                        uri,
+                        Intent.FLAG_GRANT_READ_URI_PERMISSION or Intent.FLAG_GRANT_WRITE_URI_PERMISSION
+                    )
+                    putPrefString(PreferKey.backupPath, uri.toString())
+                    launch {
+                        Backup.backup(requireContext(), uri)
+                    }
+                }
+            }
+            restoreSelectRequestCode -> if (resultCode == Activity.RESULT_OK) {
+                data?.data?.let { uri ->
+                    requireContext().contentResolver.takePersistableUriPermission(
+                        uri,
+                        Intent.FLAG_GRANT_READ_URI_PERMISSION or Intent.FLAG_GRANT_WRITE_URI_PERMISSION
+                    )
+                    putPrefString(PreferKey.backupPath, uri.toString())
+                    launch {
+                        Restore.restore(requireContext(), uri)
+                        toast(R.string.restore_success)
+                    }
+                }
             }
         }
     }