Data Protector backup job throws “Fallback to legacy filesystem backup was not allowed”

Wheb backing-up a Windows Client, sometimes the error “Fallback to legacy filesystem backup was not allowed” occurs. In most cases this is related to the CONFIGURATION object, but recently I noticed this also on the D-drive of a (SQL) server.

[Critical] From: VBDA@client “fqdnoftheclient [/D]” Time: 3/25/2014 8:16:09 AM
Fallback to legacy filesystem backup was not allowed. Aborting the backup.
[Critical] From: VBDA@client “fqdnoftheclient [/D]” Time: 3/25/2014 8:16:09 AM
[81:52] /D Not a valid mount point => aborting.

The software tries to start a backup by using the VSS integration and when this fails it fallbacks to the legacy method. If this is not defined in the backupjob properties, the backupjob will fail with the error mentioned above.

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