> how to make HTTrack start donwnloading without 
> comparing the local files with this on the surver?
Using 'Continue an interrupted mirror' action.
Note that if you aborted a previous mirror update very 
quickly, a new (small) new (hts-cache/new.*) cache 
will be built - you may have to discard it and use 
the 'old' (hts-cache/old.*) one. (the engine will 
prompt you an alert)