> I downloaded some websites, and because some of the files 
> were missing, I did continus interrrupteed download. The 
> missing files for that website was updated but for other 
> websites it got lost!! I found from the log file that 
> those files were purged! I can't re-download those sites 
> because they have been changed.

Please look at recent similar threads. In one word: files 
were purged because they were remotely deleted.

You can try to backup existing project files, erase the hts-
cache/old.* files, restart the mirorr using "continue an 
interrupted mirror" (NOT "update") and hope :)