Carbonite Security: http://www.carbonite.com/en/terms-of-use/security
Mozy Security: http://docs.mozy.com/docs/en/user-home-win/guide/tasks/install_change_encryption_win_c.html

Only reason I went with iBackup is because of all the features, Exchange backup, SharePoint backup, etc. If you don't use those, it's probably not worth it.