Persist a chron job

Hi guys

Got a bit of problem with a NAS326

I'm trying to create a persistent root chron job. I only found out recently that the Zyxel upon rebooting refreshes/reloads the OS and overwrites some (or all) files such as crontab.

I think I managed to follow along with most of what was explained in another post https://community.zyxel.com/en/discussion/8219/zyxel326-lost-settings-after-reboot-and-other

Here's a snapshot of where I got to:
Created a directory as instructed (zy-pkgs) and downloaded the web_prefix
App Center installed MetaRepository
App Center installed Tweaks
App Center installed RandomTools

I'm struggling to understand the rest of the instructions and I can't find any "Change Home Dir" tool

There was something I needed to with /etc/profile file but I'm at a loss at this point.

From my understanding, I'm making root's home directory on the NAS drive rather than making it refer to memory so that any changes become permanent rather than losing it all after a reboot. Presumably something I've installed makes the boot process check if there is a home directory present on the NAS drive. I don't know though, I'm speculating. Can anyone offer help to complete this setup?

Many thanks
J