Deduplication

Once the initial data set has been replicated to the target, only changed data blocks are transferred. Deduplication works differently in replicating and vaulting systems.

     In replication, the process connects to the target system and compares data in the backup to data on the target. This comparison runs on the source system. Once changed blocks are identified, they are replicated to the target. This keeps bandwidth utilization to a minimum as only changed blocks are sent through the encrypted connection.

     In legacy vaulting, a process on the source compares backup data on the source and target to identify changes. Changes are written to a delta file that is sent to the vault, so that only changed blocks are received.