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An important point to note is that esp. with S3 infrequent access or Glacier there are additional costs associated with restoring, which can be quite high. With S3/Glacier one needs to spend a bit of time to even figure out how much a restore would cost.

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Yes, the data retrieval fee for infrequent access is $0.01/GB so a 1TB restore would cost me $10.

Thankfully I’ve not had to perform a complete restore, though I do regular test restores of a part of the backup just to make sure it’s all still working.

Edit: It’s actually $100 (as transfer from S3->Internet adds $0.09/GB)

No, it's $100, since the egress traffic will cost ~$0.09/GB.

You’re right, I hadn’t taken that into account.

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