reallysimplebackup.timer

[Unit]
Description=Run reallysimplebackup-rsync once every 4 hours

[Timer]
# run backup every 4 hours, starting 4 hours after the boot
OnBootSec=4h
OnUnitActiveSec=4h

[Install]
WantedBy=timers.target

[Service]
Type=simple
ExecStart=/usr/bin/reallysimplebackup-rsync
StandardOutput=append:/var/log/reallysimplebackup.log
StandardError=inherit