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by dmv 6369 days ago
James Hamilton posted a fairly robust model of how to think about this (and evaluate S3), just prior to joining Amazon.

http://perspectives.mvdirona.com/2008/12/22/TheCostOfBulkCol...

His is a more datacenter-level view (considering $/GB, from the perspective of arbitrary GB), but builds a convincing case why S3 @ $0.18/GB is fair).