> > httrack --update www.foo.com -c1 -<other options>..
> But this is exactly the syntax I used, and httrack 
> still appends all options every time I run it.

Argh, you're right.. problem detected, I'll check 
that. Use '-qC2' instead of '--continue':

httrack -qC2 www.foo.com -c1 -<other options>