@indycutie Activating the testingcheatsenabled cheat by itself won't have any effect on your saves. It does what its name suggests—allows you to enable and use more cheats if you want—but nothing else. Some of the options that come with TCE enabled can be harmful in the right context, as can some of the other cheats that require TCE to be enabled first, but that's a separate matter.
Is OneDrive currently backing up the contents of your Documents folder? I think it might have been when you were here last, but the question is whether it is now. The fastest way to tell is to open a File Explorer window, right-click Documents in the left panel, select Properties > General, and look at the Location. Let me know whether OneDrive is in that file path or not.
If OneDrive is in fact running, please let me know how full it is. There should be a little cloud icon in the lower-right corner of your screen. Right-click that and select Settings, then Acccount, and you'll see the used and total OneDrive storage just under the email address.
I'm not suggesting you buy more storage if you're getting low. (And in fact I'm philosophically opposed to the idea, although other people can of course do what they want with their own computers.) This is just about determining whether OneDrive is contributing to the problem.