> 1) Is it possible to tell HTTRACK to never overwrite 
local 
> files?
Hum, not for html files, which must be rebuilt (all links 
are rebuilt inside the html file, and the building depends 
on all options)

> 2) Assume I already mirrored a site with another program 
> and have 90% of the site and want to switch to HTTRACK. 
Is 
> it possible to tell HTTRACK that the local files I have 
are 
> already a copy of the site?
Yes and no. If httrack finds the files at the place it 
would have save them, it won't redownload them. Except for 
html files, which can not be rescanned locally..