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by HeyImAlex 4678 days ago
s3cmd has a sync option that will do this.

If you're looking for something a little more robust, I just released this a couple of days ago-

https://github.com/HeyImAlex/s3tup

It's still in a really early stage but I've been using it to sync and configure my personal site that's hosted on s3 and it's worked well so far.