One drive legitimately breaks windows, well not usually but only because developers are smart enough not to use it, the A problem with One Drive is that Windows in there infinite wisdom has decided to put default folders directly into One Drive: Desktop, Documents, Pictures, etc, if a developer was to actually use these folders the auto saves, restores and virtual files stored online would absolutely break what ever is stored in there, now this might sound obvious and of course they are only for the end user developers shouldn’t touch it, but that hasn’t always been true, it wasn’t that long ago when the documents folder was used heavily for saves , but more importantly if the user tries to backup other files that contain programs you know those things that are a hassle to reinstall, then they will break programs.