Pokertracker Postgres SQL DB question

[kimchi]

Sorry about the noob Q. (and I did use the search)

I've been happily using PT for a couple of years and I keep reading about Postgres SQL. Can someone please explain what this is and why I should/shouldn't convert my DB?

Also, I have 10s of thousands of HHs on my computer. They're from Crypto so each hand has its own file (unlike Party's sessions files). I can't copy them onto CD/DVD as the sheer number of files crashes my computer during burning. I exported files from my PT DB in blocks of several hundered.

Will these exported files be suitable for re-import when I re-install Windows and everything else on my HDD? Last time I did this I was unable to completely import all the saved HHs.