I'm not quite sure what you want. I'm also not familiar with any off-site backup services. I do know that some hosts configure cPanel to automatically back up all accounts to a separate directory or hard drive. The backups are easy to restore or transfer to another server. There must be a way to automatically transfer those backups to another FTP server. In fact cPanel has some built in feature for FTP transfer of backups. I think, though, it is up to the host to automate this and you might even have to ask them to set something up to transfer the backups if you can't find an automated solution. Also beware that regular downloads of backups might eat away at your bandwidth limit.
