Re: [SOLVED?] HELP! ALL MY SAVES ARE GONE!???!!
@omgyamisocringe Your second screenshot shows three viable saves, and some backups, with a creation date of January 9 but a modified date from November. That suggests they're older than the creation date would suggest. Have you tried loading these saves? If they don't show up in-game, try manually recovering their backups. Here's how:
https://sims4.crinrict.com/eng/2014/09/recover-backup-save-game/
As for why this happened, Steam shouldn't delete your saves regardless of how many computers you use to play Sims 4. If that is in fact happening, it's a serious flaw, but I would have expected to see more cases by now. More likely is that some other syncing service is the problem, for example OneDrive. Do you use any of these? OneDrive is built into Windows, of course, but there are others like Dropbox that you can install and run manually.
Separately, have you moved the location of your Sims 4 user folder at any point, for example to an external drive? I don't mean making a backup copy but something like creating a symbolic link to tell the game to look elsewhere for your user data.