How to start a service to repeat something in android

Possible duplicate:
Regular Android task (cronjob equivalent)

I am currently trying the following code to complete a task

public class BackupService extends Service {

    private Timer timer = new Timer();
    @Override
    public IBinder onBind(Intent arg0) {
        // TODO Auto-generated method stub
        return null;
    }

    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {
        Toast.makeText(this, "Service Started", Toast.LENGTH_SHORT).show();
        startBackup();
        return START_STICKY;
    }

    private void startBackup() {

        Date date = new Date(time);
        System.out.println("Backup time:" +date);
        timer.scheduleAtFixedRate(new BackupTimerTask(), date,
                delayTime());
    }

    private long delayTime() {

        long delay = 86400000;
            System.out.println("delay time:" + delay);
        return delay;
    }

    @Override
    public void onDestroy() {
        // TODO Auto-generated method stub
        super.onDestroy();
        if (timer != null){
            timer.cancel();
            }
            Toast.makeText(this, "Service Destroyed", Toast.LENGTH_SHORT).show();
    }

  private class BackupTimerTask extends TimerTask {
        @Override
        public void run() {
            System.out.println("Backup started");
            //starting backup here
        }

    }

}

      

        
        
        
      

    

and i call this service as

startService(new Intent(this, BackupService.class));

      

        
        
        
      

    

This works fine if I overlay a short interval like 5 minutes, but it doesn't work for long intervals. And if I go to start services in Android apps, I can see that my service is up and running. I think there is something wrong with the timertask class. How can I solve my problem?