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Amazon says that S3 provides eleven nines (99.999999999%) durability of files. So if you have 100 billion objects in S3, you should expect to lose on average 1 per year. Or, if you have 10,000 files, you should expect to lose 1 per 10 million years. In addition they say it can tolerate the simultaneous failure of two datacenters. Nimbus, with 3 copies total, appears much less redundant... but nobody knows how Amazon calculated their eleven nines claim.

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