Backup of Exchange DAG environments is possible with Redstor Online Backup Plus. A client will need to be installed on each server & the Exchange VSS to be selected, this will allow the clients to backup any active databases currently on those servers.
Unfortunately the Redstor Online Backup Plus client is not DAG aware which can lead to reporting issues. When a server is inactive and has no databases running on it the client will report the backup as failed with the below errors.
No volumes selected for snapshot
There is no data available for the backup. Please check your settings and environment.
We advise that you leave the inactive server's client running so incase of a switch within the DAG environment will still lead to a successful backup without any manual intervention.
If you have any further questions about DAG backups or reporting please let us know at firstname.lastname@example.org or 0845 30 30 909