How to mirror Trisquel, and other free distros?

I see https://mirror.fsf.org/ has a mirror for the free software distros.

And https://packages.trisquel.org/search?keywords=mirror&searchon=names&suite=aramo&section=all has mirror programs.

Does anyone know if setting up a mirror is like using a torrent?

I see torrenting files can help reduce server load, though I do not know how much memory it takes to mirror distros like Trisquel.

I can check before downloading a torrent to see it's size and if I wish to torrent all, or just some of the files, but I have not tried making a mirror yet.

Or if a public mirror could be made in a way like a public torrent can be made.

And should a mirror be setup to help distros like Trisquel on "a normal Trisquel system" like torrents can, or should something else be done?

I see https://packages.trisquel.org/aramo/grsync

has a graphical interface for rsync, though if rsync is better for setting up a mirror I could try to learn how to use that or other programs.

Also if there is a better link to mirror Trisquel than the fsf one I can lookup that one.

https://trisquel.info/en/forum/download-mirrors-uk-ireland

and

https://trisquel.info/en/forum/tor-and-i2p-mirror

have some information and questions about mirrors, but I do not know how up to data both of these are.

I also did not know if all I need to build Trisquel is just the Trisquel iso image and the sources Tarball found and torrented at

https://trisquel.info/en/download

or other things I have seen at

https://trisquel.info/en/forum/finding-build-dependencies-build-dependencies-fast

like the

package-helpers
trisquel-builder
makeiso

But if public mirrors can be made easily that could help me and others both build other things as well and reduce load on servers.