best way to re-install and keep cygwin configuration

[LMH]

I am getting ready to re-install XP and I would like to avoid having to 
completely redo my cygwin install. Is there a way to export the current 
settings (installed packages, etc) and then re-import it after re-install?

I was thinking of just copying my cygwin_install directory that has 
setup.exe and the mirror folders and then reintroducing that to the new 
install, or just copying the entire cygwin root folder as well.

Is there a prescribed method for this?

LMH

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