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    <p>I see your question from two points of view, a theoretical and practical.</p> <p>From a theoretical point of view, yes, you should be concerned - and not only about bit flipping, but about several other possible problems. In particular <a href="http://aws.amazon.com/agreement/#11" rel="nofollow noreferrer">section 11.5</a> of the customer agreements says that Amazon</p> <blockquote> <p>MAKE NO REPRESENTATIONS OR WARRANTIES OF ANY KIND, WHETHER EXPRESS, IMPLIED, STATUTORY OR OTHERWISE WITH RESPECT TO THE SERVICE OFFERINGS. (..omiss..) WE AND OUR LICENSORS DO NOT WARRANT THAT THE SERVICE OFFERINGS WILL FUNCTION AS DESCRIBED, WILL BE UNINTERRUPTED OR ERROR FREE, OR FREE OF HARMFUL COMPONENTS, OR THAT THE DATA YOU STORE WITHIN THE SERVICE OFFERINGS WILL BE SECURE OR NOT OTHERWISE LOST OR DAMAGED. </p> </blockquote> <p>Now, in practice, I'd not be concerned. If your data will be lost, you'll blog about it and (although they might not face any legal action), their business will be pretty much over.</p> <p>On the other hand, that depends on how much vital your data is. Suppose that you were rolling your own stuff in your own data center(s). How would you plan for disaster recovery there? If you says: I'd just keep two copies in two different racks, just use the same technique with Amazon, maybe keeping two copies in two different datacenters (since you wrote that you are not interested in <em>how</em> to protect against bit flips, I'm providing only a trivial example here)</p>
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