Note by @fastfinge

@quanin @mcourcel The nice thing about Steam is your saves are stored to the cloud. So assuming you have lots of Internet, you could get away with a 500 gig drive and only install the game you're currently playing. If you uninstall it, you can generally just reinstall and pick back up again and all your saves will be there. Also there are smaller games like Stardew Valley that's only like 500 megs or slay the spire that I think is under a gig. It's just the AAA titles that are huge.