Except when it doesn't ask you if you want it to do that, and suddenly after investigating why my games are patching slow as shit it turns out my OneDrive is full from game patches that it synced from my Documents/My Games folder and my network speed is being destroyed by OneDrive syncing the patches up every time the launcher replaces a patch file.

I'm all in for automated backups, but let the user know that their entire user folder is gonna get synced and give an option to disable it (opt-out) on the OOBE. Make this optional and explicit.