I just found that Arch's etckeeper have a systemd timer, can be backported in gentoo too? See https://wiki.archlinux.org/index.php/Etckeeper
Not using systemd, CC'ing systemd project.
Is there something wrong with the timer that etckeeper-1.18.6 already appears to install? Granted, it runs a bash script in /etc but that is the same as what is being done with the cron script.
Well I'm using what is in stable so version 1.18.1
we will stabilize a new version then