Yeah, I had the same problem with that error code. My system image backup worked perfectly for a full restore, but I still manually copied my Documents folder for extra peace of mind.
Yeah, that's a smart precaution—manually copying your Documents folder to another drive as well would give you extra peace of mind. Let me know if that works.
Yeah, You could also try running the Windows Update Troubleshooter first, as that specific error can sometimes be fixed by clearing update caches. Good luck!