In the previous post I wrote about systemd timers.
The problem with such configuration is that, upon reboot, timers are not started automatically.
Cron is not part of Fedora Silverblue (as well as Atomic Host).
You can install (overlay) it with rpm-ostree. But it is better to avoid as much as possible to overlay packages in such systems.
So, how to take advantage of systemd instead of cron?
How to use the camera module on a Raspberry Pi 3 running Fedora 29?