If you want to operate some image backups, there’s no simple solution except bringing the backup server on the remote site to make the first full image backup.
If you want file backups, you should give a look at this thread for example :
The purpose is quite simple, i.e you make a copy of the datas from the client you want to backup on an external hard drive on the remote site, bring it to to the main site, copy files on an existing local UrBackup client in a folder included in the backup job (or connect the drive and include it in the backup job) and make a backup.
This way you will have files and their hashes on your UrBackup server and if you check the “Calculate file-hashes on the client” in the Internet section of the client, UrBackup will only transfer files which have change since the last backup.
Hope i’ve been clear …
Regards,