btrbk/contrib/systemd/btrbk.timer.in

[Unit]
Description=btrbk daily backup
ConditionPathExists=|@CONFDIR@/btrbk/btrbk.conf
ConditionPathExists=|@CONFDIR@/btrbk.conf

[Timer]
OnCalendar=hourly
Persistent=true

[Install]
WantedBy=timers.target