Distributed apps. No central server involved. Peer to peer is one. Or each app is a server too and the information propagates in ripple like style. You connect to me, we sync, then another connects to me and this way the info that only you had now he has it too (and me of course). That's the original serverless idea. Not this walled garden crap with "cloud". Cloud is just a computer that is not yours and anything you put in there it's no longer just yours (or in most cases when you lose the account is no longer yours, period! - HN has plenty of horror stories from Google, Amazon, Microsoft that shit on people and call it rain).