I have a machine I am using in a test environment and have had trouble getting backups (with NTBACKUP) to finish. Typically about half way through the computer locks up and needs a reboot. I do not have shadow copies on and have tried turning off "Automatically Turn off System Protected Files with the System State"
I have also tried backing up "C," and "D" separately from System State.
System State backs up ok.
However attempting to back up "C" and "D" were unsuccessful.
I have also tried backing up to the local hard drive instead of the external USB drive. That didn't make any difference.