To perform a snapshot restore of a Database Availability Group (DAG)
Manually suspend replication. This step applies for any snapshot provider you use.
Dismount all Exchange databases that you want to restore.
Or, when you perform the restore, click the Dismount database prior to restore option.
Click File > Select Files and Folders to Restore > from Normal Backup.
Select the Exchange policy type. For the source client, specify the DAG name.
The restore is directed to the active Exchange database, regardless of which database was backed up. NetBackup automatically detects the Exchange server that currently contains the active Exchange database.
More Information
Configuring privileges for granular operations, virtual environments, or off-host backups
Manually mounting a database after a restore
Specifying the server, client, and the policy type for a Exchange Server restore operation