how to make a cygwin ftp mirror?

[Linsong]

Hi,
   Now I want to make a ftp mirror of cygwin, but I am not very clear 
how to do it. Is there any tools or script to make this process 
automatically? And I think there should be some tools to make the mirror 
site up to date. I google for this but found nothing useful.
   Any hint will be welcomed!

BR
Linsong

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