OK, got the bulk of the backup system done. The system disks in RAID1 are copied to a backup drive every day. SQL database backups are made every day. Every week the system data is copied to a machine in a separate location here and two remote servers (thanks focal and thimo!). Every week the server VM images are backed up.
All that is left to finish off is backing up the images to the remote servers and then carefully trim down the bloat in the radmon server ... (LXDE and several desktop apps were installed which pulled in a lot of crud compared to a bare server install)