Re: DCCache exceeding 280GB
@PokeFan10025 You can find instructions for uninstalling OneDrive here:
It's not necessary to uninstall though; you could simply unlink instead. (I personally never linked in the first place, and OneDrive is still in there somewhere but doesn't interfere. But when I installed Windows, I specifically created a local account rather than signing into Microsoft.) Pick the option you like better.
Once OneDrive is out of the picture, you can simply flush everything in the File History directory that you know you don't want to keep. So that would be everything in DCCache, and possibly everything in general, but you might consider preserving a few older saves, especially if you don't have backups elsewhere. These can be copied to an external drive or uploaded to some cloud storage service (Google Drive, Dropbox) that doesn't try to sync your files on its own.
Since the game will only read the contents of Documents > Electronic Arts > The Sims 3, deleting files stored elsewhere will have no effect.