> assert failed: zip_zipWriteInFileInZip_failed
> 
> this happened 30 minutes after the electricty was
> stopped for a second.
> the computer had no interruption,
> it was the external had disk on which the copy was
> being saved that got rebooted.
> 
> Maybe this has nothing to do with the error.

The computer survived the interruption of everything on the external disk in
progress was lost, so the disk timed out, and httrack errored out.  Makes
perfect sense.

I'd do a chkdsk/f on the external drive