I have to get out of the habit of (only) checking various /etc/cron* locations for periodic system tasks. Debian is making more and more use of systemd timer tasks. The nice thing is, you can see them all with a simple command: systemctl status \*.timer Got caught out with this on a client’s machine the other day: when you install the certbot package (for managing certificates issued by Let’s Encrypt) on Debian, it also automatically adds a systemd timer to run certificate renewals twice a day, you don’t need to set up your own cron task to manage this.