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Amazon S3 Reduced Redundancy Storage - Awesome: Reduced Redundancy.

Not every application actually needs this much durability. In some cases, the object stored in S3 is simply a cloud-based copy of an object that actually lives somewhere else. In other cases, the object can be regenerated or re-derived from other information. Our research has shown that a number of interesting applications simply don’t need eleven 9’s worth of durability.