When backing up AD Domain Controller with installed AD Federation Services, the backup may fail with VSS error from SQL Server Writer. There's no SQL dropdown in the agent's properties in the Core console.
SQL Server Writer status changes to [8], seen as a result of command:
vssadmin list writers
To resolve the issue please add SQL Server Writer into the list of ignored writers. To do that on the Core console:
- click on the agent name
- click on Settings on the right pane
- scroll down to the list of detected writers, locate SQL Server Writer and click on "No"
- it'll change to the checkbox. Just mark it and click on V
- force a snapshot to verify that backup is taken
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