public class MyBackups extends BackupAgentHelper {

    @Override
    public void onCreate() {
        Log.d("MyBackups", "creating backup class");
        this.addDefaultHelper();

        String defaultSharedPrefsName = this.getPackageName() + "_preferences";
        SharedPreferencesBackupHelper defaultPrefsHelper = new SharedPreferencesBackupHelper(this, defaultSharedPrefsName);
        this.addHelper("default_prefs", defaultPrefsHelper);
    }

    @Override
    public void onBackup(ParcelFileDescriptor oldState, BackupDataOutput data, ParcelFileDescriptor newState) throws IOException {
        Log.d("MyBackups", "backing up " + data);
        super.onBackup(oldState, data, newState);
    }

    @Override
    public void onRestore(BackupDataInput data, int appVersionCode, ParcelFileDescriptor newState) throws IOException {
        Log.d("MyBackups", "restoring");
        super.onRestore(data, appVersionCode, newState);
        // post-processing code goes here
    }
}

BackupManager backupManager = new BackupManager(getApplicationContext());
int error = backupManager.requestRestore(
    new RestoreObserver() {
        public void restoreStarting(int numPackages) {
            Log.d("MyBackups", "restoreStarting");
        }

        public void restoreFinished(int error) {
            Log.d("MyBackups", "restoreFinished");
        }

        public void onUpdate(int nowBeingRestored, String currentPackage) {
            Log.d("MyBackups", "onUpdate");
        }
    }
);
Log.d("MyBackups", "requestRestore result: " + error);

adb shell bmgr run