fastest way to duplicate production server?

[RC]

We have a production FreeBSD 4.10 server running old versions of
Apache/MySQL/PHP from ports.  We'd like to upgrade Apache/MySQL/PHP
to the latest versions.  Before upgrading we'd like to test on a
test box.

What's the fastest way of duplicating the existing Apache/MySQL/PHP
(including user databases)?  (The production server cannot go down
for more than a few seconds.)

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