I dispute that - for years I've been running a script when my system shuts down that copies all files that have changed to an external disk. Getting systemd to wait until the job finishes before shutting down was a major headache. Supposedly, systemd honours rc.d scripts, but I couldn't get this to work.
I worked in COBOL for the first 8 years of my programming career. If you ever see an ancient program with ADD INSULT TO INJURY. in it, chances are it's one of mine! I always included that statement somewhere in my code.
You could also PERFORM A-PLEASURABLE-ACT UNTIL COMPLETELY-SATISFIED but I never sank that low.
"Turns out, it's much simpler with systemd."
I dispute that - for years I've been running a script when my system shuts down that copies all files that have changed to an external disk. Getting systemd to wait until the job finishes before shutting down was a major headache. Supposedly, systemd honours rc.d scripts, but I couldn't get this to work.