diff --git a/app/src/main/java/com/stevesoltys/seedvault/settings/SettingsFragment.kt b/app/src/main/java/com/stevesoltys/seedvault/settings/SettingsFragment.kt
index 227e84d4..eb41bd95 100644
--- a/app/src/main/java/com/stevesoltys/seedvault/settings/SettingsFragment.kt
+++ b/app/src/main/java/com/stevesoltys/seedvault/settings/SettingsFragment.kt
@@ -63,14 +63,23 @@ class SettingsFragment : PreferenceFragmentCompat() {
                 return@OnPreferenceChangeListener false
             }
             // main key is present, so enable or disable normally
-            try {
-                backupManager.isBackupEnabled = enabled
-                if (enabled) viewModel.enableCallLogBackup()
-                return@OnPreferenceChangeListener true
-            } catch (e: RemoteException) {
-                Log.e(TAG, "Error setting backup enabled to $enabled", e)
-                backup.isChecked = !enabled
-                return@OnPreferenceChangeListener false
+            when (enabled) {
+                true -> return@OnPreferenceChangeListener trySetBackupEnabled(true)
+                false -> {
+                    AlertDialog.Builder(requireContext())
+                        .setIcon(R.drawable.ic_warning)
+                        .setTitle(R.string.settings_backup_dialog_title)
+                        .setMessage(R.string.settings_backup_dialog_message)
+                        .setPositiveButton(R.string.settings_backup_dialog_disable) { dialog, _ ->
+                            trySetBackupEnabled(false)
+                            dialog.dismiss()
+                        }
+                        .setNegativeButton(R.string.settings_backup_apk_dialog_cancel) { dialog,
+                            _ -> dialog.dismiss()
+                        }
+                        .show()
+                    return@OnPreferenceChangeListener false
+                }
             }
         }
 
@@ -189,6 +198,19 @@ class SettingsFragment : PreferenceFragmentCompat() {
         else -> super.onOptionsItemSelected(item)
     }
 
+    private fun trySetBackupEnabled(enabled: Boolean): Boolean {
+        return try {
+            backupManager.isBackupEnabled = enabled
+            if (enabled) viewModel.enableCallLogBackup()
+            backup.isChecked = enabled
+            true
+        } catch (e: RemoteException) {
+            Log.e(TAG, "Error setting backup enabled to $enabled", e)
+            backup.isChecked = !enabled
+            false
+        }
+    }
+
     private fun setBackupEnabledState() {
         try {
             backup.isChecked = backupManager.isBackupEnabled
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
index b4976db9..428a2b24 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -14,6 +14,9 @@
     <string name="settings_backup_location_none">None</string>
     <string name="settings_backup_location_internal">Internal storage</string>
     <string name="settings_backup_last_backup_never">Never</string>
+    <string name="settings_backup_dialog_title">Really turn off app backups?</string>
+    <string name="settings_backup_dialog_message">When you turn backups on again, the backup process may take longer than usual, and it will use additional storage space.</string>
+    <string name="settings_backup_dialog_disable">Turn off anyway</string>
     <string name="settings_info">All backups are encrypted on your phone. To restore from backup you will need your 12-word recovery code.</string>
     <string name="settings_auto_restore_title">Automatic restore</string>
     <string name="settings_auto_restore_summary">When reinstalling an app, restore backed up settings and data.</string>