I use amazon s3 with jungledisk as the front end. I use this in almost all my customer locations. I had signed up with carbonite but the service burned me permanently by not backing up video files without telling me. The software at least when I tried it wouldn't back up iso's videos, and who knows what else. When I asked on their forums they said I could back those files up manually by navigating to them and checking them. What a joke. Mozy was better but the restore speed was ridiculously slow. Jungledisk is a pain in the rear to set up but I like it a lot once its in place.