How works Parse requests in SDK?

We sometimes notice some very large data entry spikes on our server, I want know when the android SDK can’t send the request, because a problem in internet failure eg, if it creates a queue and then tries to send all together?

If you create a queue, how long does that queue have a lifespan?

What’s the method that you are using to save your objects? save(), saveInBackground(), saveEventually()?