[CentOS] Backup and reinstall a CentOS server

I've got a CentOS server that crashes due to a bad hard disk. I have got a spare disk and need to format and reinstall CentOS from the SERVER CD. Backup and reinstall is a major PITA because of some of the customisations that I've done e.g. the DNS Server is set to log queries (the default does not do this). Any tips on :-

- backing up and reinstalling (is a script available)?
- is the SERVER CD still 4.4?
- Any suggestions on BIND to log queries without SELINUX throwing a fuss?


Thanks for any help!
Josh