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I think that another effect is the EU General Data Protection Regulation, it pretty much mandates encryption for data and de-dupe doesn't work on encrypted files because it makes two copies of the same file look completely different. So unless you just encrypt the whole PBBA with the same key (EMC's answer) which is definitely not best practice from a security point of view! So one of the principal reason's for PBBA's success, that De-dupe brought the price of disk tolerably close to tape goes away.