We use the Microsoft Azure Recovery Services (MARS) agent to back up system state of a Windows Server 2012 R2 server.
These backups started failing with the following errors:
Unable to perform the operation as Windows Server Backup job failed with error message: None of the items included in backup were backed up. Detailed error: Copy of the files failed. HResult:80780049 DetailedHResult:8078010E
I found nothing relevant online for these particular errors, hence this post.
- Found https://support.microsoft.com/en-gb/help/4053355/microsoft-azure-recovery-services-agent-system-state-backup-failure which says to review the WSB Failure Logs but that option is not present for some reason.
- Found that
vssadmin list writersis reporting that all VSS writers are stable.
- Found that C: had 23.3 GB free of 99.6 GB.
- Tried increasing the Shadow Copy limit on C: from 8156 MB to 20480 MB (20 % of total) but that didn't make a difference.
- Found events logged by
volsnaparound the time of the backups saying
The oldest shadow copy of volume C: was deleted to keep disk space usage for shadow copies of volume C: below the user defined limit.
- Tried increasing the Shadow Copy limit on C: again from 20480 MB to 30720 MB but that didn't make a difference either.