Solution 1:
JungleDisk, now owned by Rackspace
Solution 2:
Duplicity, is a close match for existing rsync solutions, using S3 as the target
Software for using Amazon S3 as backup service [closed]
Solution 1:
JungleDisk, now owned by Rackspace
Solution 2:
Duplicity, is a close match for existing rsync solutions, using S3 as the target