One thing to keep in mind with the major difference between a NetBackup 
appliance and a dedupe storage appliance (Data Domain, DXi, Exagrid, etc.):  a 
NetBackup appliance is a media server that can do dedupe storage but the other 
appliances require a media server in front of it.

When all is said and done, a NBU appliance and a dedupe appliance end up 
working about the same.  I usually tell customers that the main difference 
between them boil down to the following:
* The requirement of a separate media server for a dedupe appliance as noted 
above.
* Through the OST feature set, almost all dedupe appliances support the same 
capabilities as a NetBackup appliance.  The only missing feature from a dedupe 
appliance is client-side dedupe.  And I suspect that Veritas will keep that one 
in their back pocket always.
* Dedupe appliances can generally scale better than the NBU appliances.  A 
NBU5230 will go to 148 TB and a NBU5330 will scale to 229 TB (but in 114 TB 
increments) which negates this statement some but the granularity of scaling is 
better for the other appliances.

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