> httrack pereteraet always already existing files,
> ie, swings them again, although they are similar to
> files on the server.

I assume this post was mechanically translated to English since it is
completely unintelligible.  You must write simple sentences in your language
to be understood after translation.

If you Cancel a mirror, you can not resume. Cancel deletes everything in the
cache not already mirrored so Continue must redownloaded from that point on.

Mirror -> Pause/Mirror -> Resume is your friend.