I am in the final throws of purchasing a new deduplication backup and disaster recovery solution. We plan to write to a locally hosted device and then replicate to an offsite device. We have narrowed down to a couple backup devices. The players are (alphabetically):
EMC DataDomain DD2500
HP StoreOnce 2900
Quantum DXi 4701
What I would like is first hand knowledge of a device and a brief note as to why you selected a particular device over the others and whether you are happy with your decision.
Each of the devices above have unique qualities, but none appear to be hands down far and away the ultimate solution. Price is a factor, but not the limiting factor. I am trying to reduce my backup window and increase my recovery points while reducing my recovery time objective.