Okey, a bit odd question maybe. I have som experience with openhabian and think it is a wonderful package/os. openahabian-config with all what it gives makes it easier to maintain.
I’m planing on running a RPi zero with ser2net to move my RFXtrx433, and have the idea to use openhabian as base, but not to run openhab. I just want the benefits that openhabian gives with backup, zram and so on.
What is the easiest way do disable openhab to start on boot on openhabian?
As a Zero has very little memory you should also disable all other services you do not need (e.g. zram-config and frontail).
Only ser2net will not write to disk so you do not need zram. Do not install it (there is an option in openhabian.conf).