How does the site archive work?

Question

Data archiving

Good afternoon!
Tell me, how does a site that shows old versions of sites like https://web.archive.org/ work?
Does he make backups somehow? Or are they saved somewhere?

Answer 1

Of course, he makes backups of them somehow (for example, wget). And they are saved somewhere (for example, on a disk).

Answer 2

1) The robot visits the site
2) Make a copy of the html + css page
3) Saves it to disk.

Answer 3

It simply saves the html page with all the necessary resources. If you want to do something similar, there is HTTrack.