The best replacement for exagrid is data domain.

The best alternatives to exagrid are rated as following:
★★★★★  data domain
★★★  avamar
★★★  unitrends
★★  hp d2d
★★  dr4000
★  falconstor

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Speaking about exagrid, one probably shouldn't forget about veeam.

Other search terms related to exagrid and their ratings are:
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Google Trends

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exagrid
data domain
avamar