Masquerading in 7.2 - Upgrade to 8

hi, I have a machine with Suse 7.2 doing IP forwarding and masquerading for my network. It's also doing dial on demand. I'd like to upgrade that machine to 8.0. What id like to know is specifically which files from the 7.2 machine I should back up and study to know the parameters it's currently using so that when I do the 8.0 install I can properly set up similar services. I didn't do the original configuration so it's all very confusing. Can anyone help? Thanks, Nick