Windows server CAL’s

Hello everybody. I have a big problem. 🙂 I’m restyling my network, taking off one old server and making many necessary changes. So, my problem is that: I bought in 2006 10 additional CAL’s for windows server and other 10 additional CAL’s for my exchange server and… now I don’t know how can i BACKUP IT, or EXTRACT IT, to save IT, because i need it when i re install my entire domain controller. There is one way to find the licenses file to use in my server after i re install. I’ll re activate with microft of course, but i can’t find the licenses pack, so i have to backup it.

Thanks a lot
Rafael Da Silva
Microsoft System Administrator
PS: sorry for my bad English, I?m not mother tongue