At the scheduled time, Arcserve Backup connects to the agent running on the Replica server and asks Arcserve Replication to create shadow copies of the volumes that are hosting the replicated data for the scenario being backed up. When the request is received, the continuous real-time replication of the scenario is temporarily suspended to facilitate the creation of the shadow copy. After the shadow copy is created, the Replica server resumes performing real-time replication and the agent running on the Replica server proceeds to perform the backup from the shadow copy. You can install the Arcserve Backup server on the Replica server or as a separate dedicated server.
For SQL Server and Exchange scenarios, when the backup is complete, the shadow copy is preserved and removed only if the maximum number of retained shadow copies is reached. By default, Arcserve Replication creates and preserves 10 shadow copies and then begins replacing the oldest shadow copies with newer ones. You can change the setting for the number of shadow copies preserved using the Number of Shadow Copies Set To Keep property on the Arcserve Replication Manager.
Note: For more information on setting the number of shadow copies to be kept, see the Arcserve Replication and High Availability Administration Guide.
For File Server scenarios, when the backup is complete, the shadow copy is preserved and not removed at all.
When you back up a scenario with Assured Recovery configured, the backup is application-consistent and requires no application recovery after restore. When you back up a scenario with Suspend enabled (no Assured Recovery configured), the backup may require application recovery after restore, depending upon the state of the application at the time of the backup.
Performing the backup on the Replica server allows the Master server to continue working without any interruptions or performance degradation. In addition, all backup catalog information is recorded as if the backup was performed on the Master server, ensuring that the restore view of the data will always be the same as if the backup was taken directly from the Master server. You can recover the backed-up data to the Master server or to the Replica server using Arcserve Backup.
In addition, for multistreaming backup jobs, each Arcserve Replication scenario is backed-up as a child job. If one node contains multiple scenarios, the master job will split them so that each child job will back up one scenario.
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