> As a test, I mirrored the site and a few hours later used
> the "update" function and even though only about five
> messages were added to the forum, WinHTTRACK took about an
> hour to scan the site, updated hundreds of files which 
never
> changed and doubled the size of the folder on my local
> machine to which the mirror is saved. What did I do wrong?
Most dynamically generated scripts are - unfortunately - 
unable to answer correctly to update requests, and force a 
global redownload. The "double size" problem is probably 
related to the cache (hts-cache/old.* entries) - you can 
remove the old.* files after the mirror.