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You probably want to go into a bit more detail on exactly what you want to backup. Are you talking the entire system, flat files, databases...?
Docker configs, sensitive documents, pictures, a limited amount of video files...
Cron + rsync is always a bulletproof solution. Simple bash script that runs every X minutes to sync to a network target. Wouldn't need to be only when the machine starts as you mentioned.
I will probably start with this approach and see where it leads me, thanks!
Since you're interested in this kind of DIY, approach, I'd seriously consider thinking the whole process through and writing a simple script for this that runs from your desktop. That will make it trivial to do an automatic backup whenever you're active on the network.
Instead of
cron, look into systemd timers and you can fire off your script after, say, one minute of being on your desktop, using a monotonic timer likeOnUnitActiveSec=60.Thinking through the script in pseudo code, it could look something like:
rsync -avzh $server_source $desktop_destination || curl -d "Backup failed" ntfy.sh/mytopicThis would pull the back from your server to your desktop and, if the backup failed, use a service such as ntfy.sh to notify you of the problem.
I think that would pretty much take care of all of your requirements and if you ever decided to switch systems (like using
zfs send/recvinstead ofrsync), it would be a matter of just altering that one script.