I removed the "system state" from the resource selection list and the full backup worked. I backup the drives, shadow components & utility partition for the DC backup job. I kept the "system state" for all other backup jobs, they are working, leave...
Job still failed for the domain controllers. The user account being used is a member of: domain admins, admins & backup operators. There is no SQL running on these domain controller machines.
I am having the exact same issue today after installing HF's 327039 & 334837. The backups are only failing on the domain controllers DC's. We are running v12.5 with SP3 and three additional HF's 336087 (prev applies - all was good), 327039 (applied...