Depends on how weird of a bullshit you're doing and what engine are you using, but sometimes it's even easier, you just use the readily available module.
As for the second point, you avoid it by giving the user control on when they save, you allow them to save unlimited amount of times, and you do some autosaves here and there. We have this technology since forever, we just never used it on consoles before because hard drives for it were expensive