> HTTrack download 1/3 of the web site. And when i
> want to download the other, all files are delete.
> But I use "Continue interrupted download".
> How i can download the site twice and resume in one
> hour (without delete files) ?
When a mirror completes or if you cancel a mirror, httrack delete files not
downloaded by default (options -> build -> do not purge old files=unchecked)

The easiest way is do not cancel a mirror.  Use Mirror -> pause. Httrack will
stop, minimize it, later resume.