I'm more upset than I've been in a while.
Windows 11 sets the default documents folder to onedrive\documents. Anything that gets saved there gets backed up to one drive. This includes various save games, all my Reaper stuff, and various other odds and ends that I like to, you know, save.
To save disc space, OneDrive also defaults to files being online-only. They're not stored on your device, they're just listed there. So despite what they call it, this is in fact not a backup at all, because it doesn't create an extra copy. It is actually just transferring your most precious, irreplacible, personal files to Microsoft in the background, and trusting that nothing will happen. You can see where this is going, but just to underline the point with a bleeding fucking dagger, I did not ask for any of this, I just clicked save like I have done for the last twenty or so years of my life using Windows.
Since I don't care about and have never intentionally used onedrive, I signed out of it. Flash forward six months, the files that I thought were on my computer (because I can go see them there in the folder) are in fact gone from my hard drive, and also Onedrive nuked them from orbit.
Years of my life, gone without a trace. Thanks so much, Microsoft. Whoever came up with all those ideas probably got massive performance bonuses, because we're in the worst timeline.
Goodnight.