The question is often asked: “Which is better Target or Source based deduplicaiton?”

The answer: Both.

Watch the video below to find out more.
http://vimeo.com/30139705

Below is a screen shot that shows a Data Domain system being selected as the backup target from the Avamar Admin Console.

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Also to note, the metadata for the Data Domain backup data sets are sent to the Avamar server so when a client needs to restore, the process is automated straight off the Data Domain system without going through the Avamar Server.