Rsync over SSH to your remote server. You can use a free system such as rsnapshot - have your backup system offisite so your data can be considered safe in terms of local site disaster, and do locally at your secondary site backups to disks in removable caddies for archival purposes. You can even have multiple archive copies if you wish for those broken drives that inevitably happen. You can also have your last x days backup accessible live so your users can recover their data automatically without tape insertion etc.