The above explanation (No. 1 to 6) on how 'update' works is great. Clear and
complete enough for me. 

Thanks! 



P.s: I think 'continue' and 'update' sounds confusing. This should be
clarified officially in the FAQs.

P.s 2: I think HTTrack should be able to continue exactly where it left off,
if we 'cancel' the mirroring or shut down the computer. Like (open source)
JDownloader (file downloader). If not, this should be clearly stated in the
FAQs.