System Administrators Toolkit: Backing up key information:
"Most UNIX® administrators have processes in place to back up the data and information on their UNIX machines, but what about the configuration files and other elements that provide the configuration data your machines need to operate?"
Usually to backup configs on a unix system, I just tar/gzip all the "files" in the etc directory using a cronjob. The files are then transferred over to the backup server. So far I haven't had a problem. The article basically does the same.