Hey,
Of course, it's always nice to have a complete image of your server in case of failure. But in the field, this is a bit hard. Shutdown the server, start your image manually, restart server. Downtime server: x-hours...
There's a backup option in the webmin, but i recall that this wasn't working for 100%.
For the moment, i created a folder and small script that copies automatically every night all files i ever changed. For example the dchp-extra file, eibd files...
It would be nice that all configuration (db?) would be copied each night to a remote storage, no?
Than when a crash occurs, you can reinstall and restore an up to date config...
Any thoughts about the best way to backup your configuration daily?