Maintaining my system

Hi all,
An off topic question.
As my network grows, I’m not sure how to keep it updated.
I run NUC with Proxmox, several VM’s and a few pi’s.
Right now I update manually the os, apps and containers on each device, but it is becoming very hard to maintain.
So, how do you keep your system updated?

Unattended Upgrades:

https://wiki.debian.org/UnattendedUpgrades