Need help with reformatting to GUID partition so I can install Snow Leopard

I'm trying to upgrade to Snow Leopard, but since I replaced my hard drive last year, it was automatically formatted to Apple Partition Map, I'm not sure of the proper way to fix this.
I have Time Machine running with an external 500gb drive, the same size as my upgraded internal drive. What procedures should I use to safely back up ALL of the information currently on my computer, reformat the main drive, then restore all of my current information to the new style partition? I have 5-6000 photos, as well as 1500-2000 mp3 files I hate to lose. Should I back these up separately to a DVD or something first?
Any help, step by step, would be helpful, as I'm not very experienced with such matters.
Thanks......

ludwigvan66 wrote:
What procedures should I use to safely back up ALL of the information currently on my computer, reformat the main drive, then restore all of my current information to the new style partition?
The brute-force approach would be to buy an external disk drive and use use Carbon Copy Cloner (http://www.bombich.com/) or SuperDuper! (http://www.shirt-pocket.com/) to create a bootable "clone" of your disk. Then verify that you can boot from the "clone", reformat your internal drive, then use the same software as above to copy your files back to the internal drive.

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