Volume does not have enough free disk space to create VSS snapshot

[brjohnson]

A backup job reported that a volume did not have enough free space to create a VSS snapshot, but I checked what was recoverable in the Guest File Restore browser, and the volume appears to be there for the job that produced the alert. I know VSS is necessary for Application-Aware processing, but this job does not have that configured.

What, specifically, is lost when Veeam is unable to create VSS snapshots?

[Vitaliy S.]

Hi Brett,

VSS snapshot is required to have a consistent backup state. If you're running highly transactional applications in these VMs, then some operation might have been lost.

Thanks!

[Nas]

Hi Vit,
As the agent backup job still finished with success/warning when Veeam says Volume (C:) does not have enough free disk space to create VSS snapshot, so Veeam can still create crash consistent backup without VSS snapshot, just that it wont be application/transaction consistent backup, right?