Windows Upgrade Help and more

This. Yeah, that USB trick can work, but honestly, 6GB is really pushing it—Windows 11 might run, but it'll probably be pretty sluggish.

So basically, A system image backup is a solid safety net, but for extra peace of mind, I'd definitely manually copy that Documents folder to a separate location on your external drive as well. That way your most important files are in two places if the upgrade goes sideways.