Android - guardar datos cuando la aplicacion corre en segundo plano

public class MainActivity extends AppCompatActivity     {

    private mcSFView moView;

    private mcSFView.mcThread moThread;

    private mcRestoreGame moRestoreGame;

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        moView = (mcSFView)findViewById(R.id.viewBoard);

        FragmentManager fm = getFragmentManager();

        moRestoreGame = (mcRestoreGame) fm.findFragmentByTag("DataGame");

        if (moRestoreGame == null) {

            moRestoreGame = new mcRestoreGame();

            fm.beginTransaction().add(moRestoreGame, "DataGame").commit();

        }

    }

    @Override

    protected void onResume() {

        super.onResume();

        moThread = moView.setThread();

        if (moRestoreGame.getData()==null) {

            moThread.setMaxPoints(getGameType());

            moThread.setDifficultyLevel(getGameDifficulty());

            moThread.setPlayerName(getPlayerName());

            moThread.doStart();

        } else {

            moThread.moGame = moRestoreGame.getData();

            moThread.setMaxPoints(getGameType());

            moThread.setDifficultyLevel(getGameDifficulty());

            moThread.setPlayerName(getPlayerName());

            moThread.restoreState();

        }

        moThread.setRunning(true);

        moThread.start()

    }

    @Override

    protected void onPause() {

        super.onPause();

        moRestoreGame.setData(moThread.moGame);

        moView.getThread().pause();

    }

public class mcRestoreGame extends Fragment {

    private mcGame moData;

    @Override

    public void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setRetainInstance(true);

    }

    public void setData(mcGame oData) {

        moData = oData;

    }

    public mcGame getData() {

        return moData;

    }

}