I'm looking at AndroidManifest files and I see entries for android:backupAgent and according to the Documentation android:backupAgent is
The name of the class implementing BackupAgent to manage backup and restore of the application's settings to external storage.
But I can't find a BackupAgent interface or any other documentation. Can someone point me in the right direction?
BackupAgent's API is not solidified yet, so it's a hidden class. You can check it out on Android's git, where there is this comment:
/**
* This is the central interface between an application and Android's
* settings backup mechanism.
*
* @hide pending API solidification
*/