Enable backups if client side encryption is enabled

src/main/AndroidManifest.xml

@@ -62,7 +62,9 @@ limitations under the License.
 
     <application
         android:name=".Startup"
-        android:allowBackup="false"
+        android:allowBackup="true"
+        android:fullBackupContent="@xml/backup_rules_30_lower"
+        android:dataExtractionRules="@xml/backup_rules_31_higher"
         android:hardwareAccelerated="true"
         android:hasFragileUserData="false"
         android:icon="@drawable/ic_launcher"

src/main/res/xml/backup_rules_30_lower.xml

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="utf-8"?>
+<full-backup-content>
+    <include domain="sharedpref" path="." requireFlags="clientSideEncryption"/>
+    <include domain="database" path="." requireFlags="clientSideEncryption"/>
+    <include domain="external" path="." requireFlags="clientSideEncryption"/>
+</full-backup-content>

src/main/res/xml/backup_rules_31_higher.xml

@@ -0,0 +1,13 @@
+<?xml version="1.0" encoding="utf-8"?>
+<data-extraction-rules>
+    <cloud-backup disableIfNoEncryptionCapabilities="true">
+        <include domain="sharedpref" path="."/>
+        <include domain="database" path="."/>
+        <include domain="external" path="."/>
+    </cloud-backup>
+    <device-transfer>
+        <include domain="sharedpref" path="."/>
+        <include domain="database" path="."/>
+        <include domain="external" path="."/>
+    </device-transfer>
+</data-extraction-rules>