Anyone using Amazon S3 for backup?

Is anyone using Amazon S3 for backup? Instead of getting another independent server, setting up rsync, etc. this seems like a good solution for backing up a server or sql database. Sure, my ISP does daily backups, but having more control by backing up the database off-site would make me sleep better.

Anyone have any experience? Good, bad, suggestions, ideas? Any other alternatives worth looking at?

Cliff
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