Cron to systemd timer

Convert a crontab schedule into a systemd .service plus .timer with OnCalendar=, Persistent=, and a oneshot ExecStart.

Crontab (5 fields or @hourly / @daily / @weekly / @monthly / @yearly / @reboot) Unit name User Description ExecStart AccuracySec WorkingDirectory

Persistent=true Type=oneshot

site-backup.timer