Use httrack to download just one site, not external sites
Solution 1:
Found a questionable solution here: Subject: Re: prevent download of external content.
The problem is that now external links point to a page that looks pretty ugly, which is fixable.
However, embedded content, like youtube, is now also replaced by this ugly page :(
At least it is not downloading the entire internet anymore...
Solution 2:
Try
Maximum mirroring depth = 1 (Keep this 2, when 1 doesn't work)
And
Maximum external depth = 0 !! Worked for me