I am using WinHTTrack Website Copier 3.23 (+swf).

When mirroring a site in particular, 
<http://antwrp.gsfc.nasa.gov/apod/archivepix.html>), 
if a secondary link should later becomes extinct, does 
HTTrack remove the link and associated files from my local 
hard drive?  If yes, how do I prevent that?  I would like to 
preserve whatever was once there or update whatever has 
changed but never delete locally what was once captured.