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 1eee3d582..e0efa4b9e 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
@@ -9,6 +9,8 @@ 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
 
@@ -41,60 +43,64 @@ 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()
         }
     }
 
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 fd1188e77..c37e93149 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
@@ -33,9 +33,7 @@ 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
 import org.jetbrains.anko.toast
 
 class MainActivity : VMBaseActivity<MainViewModel>(R.layout.activity_main),
@@ -128,9 +126,7 @@ class MainActivity : VMBaseActivity<MainViewModel>(R.layout.activity_main),
     override fun finish() {
         if (!BuildConfig.DEBUG) {
             launch {
-                withContext(IO) {
-                    backup()
-                }
+                backup()
                 super.finish()
             }
         } else {
@@ -165,7 +161,9 @@ class MainActivity : VMBaseActivity<MainViewModel>(R.layout.activity_main),
             val uri = Uri.parse(backupPath)
             val doc = DocumentFile.fromTreeUri(this, uri)
             if (doc?.canWrite() == true) {
-                Backup.backup(this, uri)
+                launch {
+                    Backup.backup(this@MainActivity, uri)
+                }
             } else {
                 selectBackupFolder()
             }
@@ -201,7 +199,11 @@ class MainActivity : VMBaseActivity<MainViewModel>(R.layout.activity_main),
             PermissionsCompat.Builder(this)
                 .addPermissions(*Permissions.Group.STORAGE)
                 .rationale(R.string.tip_perm_request_storage)
-                .onGranted { Backup.backup(this, null) }
+                .onGranted {
+                    launch {
+                        Backup.backup(this@MainActivity, null)
+                    }
+                }
                 .request()
         }
     }
@@ -235,7 +237,9 @@ class MainActivity : VMBaseActivity<MainViewModel>(R.layout.activity_main),
                         Intent.FLAG_GRANT_READ_URI_PERMISSION or Intent.FLAG_GRANT_WRITE_URI_PERMISSION
                     )
                     putPrefString(PreferKey.backupPath, uri.toString())
-                    Backup.backup(this, uri)
+                    launch {
+                        Backup.backup(this@MainActivity, uri)
+                    }
                 }
             }
             restoreSelectRequestCode -> if (resultCode == Activity.RESULT_OK) {