Is there any way to configure httrack to update a local mirror and have it
*not* redownload an image link if a local copy already exists.

Basically, I'm trying to keep historical mirrors of an image board that
updates rather frequently, so httrack sees the pages as "new". But even though
the pages are new, the links to images are always the same, and it looks like
httrack is redownloading all the images each time i try to update the mirror.

Any help or way around this would be much appreciated. I just want to update
the html, and grab images if they *don't* already exist in the local copy of
the site.

Thanks :D