> What about resuming from a program or computer
> crash? Httrack offers this function, but it never
> seems to work

In case of crash, httrack attempt to repair the cache (the hts-cache.zip
file), which is not always possible. This might be the cause of problems ;
besides, entries not yet validated and still pending in memory are not flushed
in case of crash, causing a re-download.

Try to use "Continue" rather than "Update" ; this should improve the
efficiency.