How to perform routine maintenance

Daily

bash

systemctl --failed
df -h /
journalctl -u sshd -p err --since "24 hours ago" --no-pager | tail -30

Weekly

bash

yunohost diagnosis run
fail2ban-client status
apt list --upgradable 2>/dev/null | head

Monthly

Reboot if /var/run/reboot-required
docker system prune if Docker used
Test a backup restore on a non-prod path or list archives and restore drill