FMHY backup / locally?

Could there be option to make FMHY backup in .zim format for offline viewing in Kiwix browser?

I know that on FMHY website, there are backups of FMHY on other sites, and there is source code, but is it possible to make the site into a .zim backup also? As it would be much easier for me to view offline than the other options there for me.

I tried to get the site into .zim file myself using zimit site, but unfortunately failed, as when I opened the .zim file, it said "error 404".

So I want to ask, is it even possible to do this with the site? And if yes, is there someone who has Linux and could try to make this a reality?

(As I would want to preserve this sites but maybe in simpler way to someone that doesn't use Linux and doesn't know the selfhosting the site under it.)