You can restore Exchange Server 2010 databases in the Database Availability Group (DAG) using SnapManager Restore operation.
You can restore a database in a DAG from the following restore sources:
SnapManager backup copies created on the same Exchange server
Backup sets created on multiple Exchange servers in the DAG
Unmanaged media
You can restore data to a specified Frequent Recovery Point (FRP).
You can also restore a database to the Recovery Database.
Backups available for restore in a DAG
When the SnapManager MMC snap-in connects to a Database Availability Group (DAG), you get a consolidated view of all backups in the DAG. You can then select a backup copy to restore.
Reseeding after a restore operation in a DAG
Because restoring a database in a Database Availability Group (DAG) does not automatically reseed it, you might need to do so manually after a restore operation.