If you have 20 TB of data to backup, I would say most data deduplication appliances on the market today can handle that without too much of a problem. When you start scaling to 50 TB, 100 TB, 1 PB of backup data, the dynamics really change. You have backups going on. You have recoveries going on. You have data being moved off to tape. It just becomes a much more complex, dynamic environment.
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Some of the technologies I personally think are enterprise-ready are Dilligent Technologies and Sepaton. Both companies have had products on the market for some time now, and they are both having pretty good success in the market.
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