Backup the basics of the system.

[Joshua Isom]

I'm about to downgrade from -CURRENT to 6-STABLE, and since I can't 
seem do it in place without screwing around with a lot of stuff, I 
might need to reinstall completely.  But which configuration files are 
the ones I need to backup the most?  I know rc.conf and loader.conf, 
but what else would be needed to easily restore the setup of the 
system?  Would I just somehow be able to use mergemaster to get a diff 
and manually apply everything?