Support helped me check the VSS Writer list. All were in a good state. We also ran a VSS trace, which was inconclusive.
While testing pausing DFS replication during the backup, I discovered the following Error 513 in the Application Event Log:
An error occurred in Cryptographic Services while processing the OnIdentity()call in System Writer Object.
AddLegacyDriverFiles: Unable to back up image of binary Microsoft Link-Layer Discovery Protocol.
Access is denied.
The cause of this error is related to the VSS writer not having permissions to the NT AUTHORITY\SERVICE.
- Open an administrative Command Prompt window, and then run the following command to check the current permissions:
- sc sdshow mslldp
- Copy the output string from step 1, append it with (A;;CCLCSWLOCRRC;;;SU), and then run the following command to add the access permission to Mslldp.dll:
- sc sdset mslldp <string>
- For example, run the following command:
- sc sdset mslldp D:(D;;CCDCLCSWRPWPDTLOCRSDRCWDWO;;;BG)(A;;CCDCLCSWRPWPDTLOCRSDRCWDWO;;;SY)(A;;CCDCLCSWRPDTLOCRSDRCWDWO;;;BA)(A;;CCLCSWRPWPDTLOCRRC;;;SO)(A;;LCRPWP;;;S-1-5-80-3141615172-2057878085-1754447212-2405740020-3916490453)(A;;CCLCSWLOCRRC;;;SU)
The above steps resolved my issues with 24 hour VSS snapshot creation times.
Hope this helps someone else.