> site: you have to tell the program if you want it to
> download a site, and store it unchanged, or download
> a site and update it as the original changes.

The first run, the action defaults to Download
The subsequent runs will be action = Update. New or changed files will be
(re)downloaded. Files no longer connected will be deleted (by default.)

By default Httrack modifies all links on download files to point where they
are on your machine so you can browse them while offline.