To restore your system configuration, you can install timeshift:
sudo apt install timeshift
As far as I can see, Zorin already contains what this script is supposed to make possible.
Such a post-install script is normally used after a new installation to set up certain things. This one is mainly about adding other (third-party) sources. Zorin already offers this option and you only have to configure the settings in the Softwarmanager. You can add any other sources immediately.
The script is not intended to restore the system.
With timeshift, for example, you can create restore points (also automatically according to a specific schedule) and reset the system to a previous state.
With timeshift you can also create a USB boot stick with which you can restore your system including all additionally installed software applications and settings (it creates an .iso file).