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If you are hacked, someone could get your S3 credentials and delete your content. You should backup.

It would be wonderful if S3 offered a write-only, no-overwrite mode so you could upload stuff from servers without storing credentials.

You can actually kind of do that. There's a system intended to allow random users credential-free upload access to your buckets via POST, but you can enforce policy control like "the target has to have xyz/ as a prefix" and "the size must be fewer than 100000 bytes". Here are the S3 docs for it: http://docs.amazonwebservices.com/AmazonS3/2006-03-01/index....

On second glance, it doesn't support "no overwrite".

Ah, thanks, this is very useful.

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