LR catalogue and updating to Snow leopard

Hei,
I am about to update my my OS X (Leopard) to Snowleopard and was thinking of doing a complete update, since my mac has become quite slow, so I'd like to use this opportunity.
My question is concerning my LR (v. 2.4) catalogue. I don't store my photos on my mac itself but on external hds and use Time Machine to only back up my system. After reinstalling LR on Snow leopard, is it enough to put the catalogue back to the same destination it was on Leopard? Will the LR catalogue find the photos on the ext. hds?
It would be a desaster if all LR work would have be in vain, approx. a year worth of work.
Has anyone done what I am about to do? Any experience? Any idea how to do this?
thanks for any answers!
Sasku
imac - osx 10.5.8.

Sasku
A couple of comments:
1) Apple do not recommend doing what used to be called an "erase and install" with Snow Leopard however there are plenty of sites that recommend what you are proposing. I upgraded from Leopard to Snow Leopard on a machine with a fair number of existing apps installed without doing an erase (I don't have the time) and have had no problems.
2) In terms of ensuring your "edits" are saved, you should ensure that you have saved the changes you have made to the metadata for the images on your external hard-drive. I have LR2.4 set to do this automatically (i.e. write xmp) but if you don't you can select to save metadata to those files (before you upgrade OS) under the "Metadata" menu item.
Raf

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