Silversword, most of my clients in one of my servers are also internet backup clients. They create backups in the backup storage like normal. You can just rsync the entire backup folders to another location if you wish to create a offsite backup.
The only thing to keep in mind is how to restore the image backups. The server keeps track of the backups, which are incremental etc in it’s database. If you wish to restore a server through the restore CD you have two options, a manual restore using:
https://urbackup.atlassian.net/wiki/spaces/US/pages/2981890/How+to+restore+via+command+line
Or two, through a UrBackup server, here’s where it gets tricky, you’ll need the database from the original server you backed up to, extract the relevant client data, and import it in the urbackup server you you wish to use for restore. This part requires some scripting to exact data from a SQLlite3 database, and import it in your current UrBackup server’s database. I’m using a modified version of this script to do that. In my case this works quite well for offsite backups: