Disable all the backups.

androidApp/src/main/AndroidManifest.xml

@@ -1,17 +1,22 @@
 <?xml version="1.0" encoding="utf-8"?>
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:tools="http://schemas.android.com/tools"
     package="bou.amine.apps.readerforselfossv2.android">
 
     <uses-permission android:name="android.permission.INTERNET" />
     <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
 
     <application
+        android:allowBackup="false"
+        android:fullBackupContent="false"
+        tools:replace="android:allowBackup"
         android:name=".MyApp"
         android:icon="@mipmap/ic_launcher"
         android:label="@string/app_name"
         android:supportsRtl="true"
         android:networkSecurityConfig="@xml/network_security_config"
-        android:theme="@style/NoBar">
+        android:theme="@style/NoBar"
+        android:dataExtractionRules="@xml/data_extraction_rules">
         <activity
             android:name=".MainActivity"
             android:theme="@style/SplashTheme"

androidApp/src/main/res/xml/data_extraction_rules.xml

@@ -0,0 +1,17 @@
+<?xml version="1.0" encoding="utf-8"?>
+<data-extraction-rules>
+    <cloud-backup>
+        <exclude domain="root" />
+        <exclude domain="file" />
+        <exclude domain="database" />
+        <exclude domain="sharedpref" />
+        <exclude domain="external" />
+    </cloud-backup>
+    <device-transfer>
+        <exclude domain="root" />
+        <exclude domain="file" />
+        <exclude domain="database" />
+        <exclude domain="sharedpref" />
+        <exclude domain="external" />
+    </device-transfer>
+</data-extraction-rules>