Sure. Just off the top of my head, there is ExaGrid. Google is your friend 
though. Do a google search for "data deduplication" and see what turns up.

On Sep 2, 2010, at 4:19 AM, Mats Atari wrote:

> Hello NetWorker list. 
> 
> I am keen on your advice regarding deduplication devices for NetWorker backup 
> environments. 
> 
> I am all into doing with DataDomain, both VTL and NFS ways. However, not to 
> blindfold myself to much - are there any competitors, which could compare 
> with 
> DataDomain today?
> 
> I would appreciate any suggestions on other devices with similar or near 
> functionality as DataDomain.
> 
> WKR
> Mats Atari
> 
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