Dell PowerVault DL2100 - Manual (Page 3)

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How does Off-host Backup Work?
Off-host backup minimizes the impact to the LAN by moving backup data across the SAN during the backup process.
An off-host backup is performed on the following manner:
1) The PowerVault DL Backup to Disk Appliance powered by Symantec Backup Exec in conjunction with Backup
Exec Remote Agent installed on the protected server (Exchange in this example) prepare the remote server
for protection
2) The MD3000i Storage Array creates a snapshot of the protected server’s data residing on the array.