[Service]
Type=oneshot
ExecStartPre=notify-send "Backup starts"
ExecStart=/etc/backups/run.sh
ExecStopPost=-bash -c '[[ $EXIT_STATUS == 0 ]] &&  notify-send "Backup finished: Drive can be removed."'
ExecStopPost=-bash -c '[[ $EXIT_STATUS != 0 ]] &&  notify-send "Backup failed." -u critical'