If you only want to upgrade the modules you use, then you don't want a CPAN mirror. Just go to CPAN.pm and enter "r" to see what modules are out of date.

Of course, you could add a regex match in the loop that mirrors individual modules if you wanted. Beware that this will then delete the other modules you may have downloaded to that tree before.

-- Randal L. Schwartz, Perl hacker