What to backup for named?

[Joe Kraft]

After a recent disk failure, I left myself a note to add the DNS/DHCP 
info to my backup.

I have a small, over-engineered for my education, network of 10 
computers in my house.  I run BIND with dynamic zones on my FreeBSD 
server, I also use the DNS service on my Win2k-AD server.  They both are 
designated as slaves for each other.

What do I need to backup?  Are just the configuration files from 
/var/namedb/etc/namedb enough to recreate everything if my FBSD server 
dies?  Or are there some database files I should be keeping also?

I tried googling, but either this is way to easy of a question or I'm 
not looking in the right places.

Thanks for any insight,
Joe.