s3sync
http://s3sync.net/wiki
a ruby rsync command line tool, that mirrors folders on S3.
* S3 directories readable by any S3 browser (including standard HTTP calls)
* Bandwidth heavy; non encrypted
HOWTO; http://blog.eberly.org/2006/10/09/how-automate-your-backup-to-amazon-s3-…
Duplicity
http://duplicity.nongnu.org/index.html
GNU tar style backup tool, with many backing stores (SCP, FTP, S3).
* Fast, bandwidth efficient deltas
* Encrypted





