Are you an OpenSolaris
user? Do you use ZFS
? Have you tried the ZFS Automatic Snapshot
service? If so, you might be interested in a new tool that I just published over at Project Kenai
that enables you to encrypt and store ZFS snapshots to either the Sun Cloud Storage Service (Employees Only at the moment) or Amazon's Simple Storage Service
You can find all of the details, documentation and download instructions (as well as a Mercurial gate) at the ZFS Encrypted Backup to S3 project page. So, please give it a try and let us know what you think!