The best replacement for data domain is avamar.

The best alternatives to data domain are rated as following:
★★★★★  avamar
★★★★  exagrid
★★★  quantum
★★★  protectier
★★★  commvault
★★  dell dr4100
★★  storeonce
★  quantum dxi
★  puredisk
★  netbackup appliance
★  dell dr4000
★  symantec appliance
★  falconstor
★  hp d2d
  sepaton
  centera

Your alternative for data domain is not listed? Suggest!
Speaking about data domain, one probably shouldn't forget about veeam.

Other search terms related to data domain and their ratings are:
★★★★★ veeam
★★★★ tsm
★★★★ backup exec
★★★ commvault
★★★ avamar
★ netbackup
★ oracle rman
networker
You have in mind a companion for data domain and it is not yet here? Propose!



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data domain
avamar
exagrid