Doing a fresh install - what to save?

[Bruco]

I'm retiring my old FreeBSD 6.3 box because, well, it's dying. It blew the power supply, then one of the drives failed, plus all the hardware is at least 5 years old. It is time to upgrade.

So I have my fancy new home server built with lots of RAM and terabyte drives and it's running Debian (wait! I can explain!). I wanted to learn more about Linux and I wanted to be able to run VirtualBox, which isn't ready for BSD yet (though there's progress, which is very cool).

(Let me quickly share my thoughts on Debian: I picked it because people seem to like its stability, and that's my first priority for a box that's going to run 24/7. It's good - but it's almost too easy. What I mean is, when I configured samba on my FreeBSD box I edited smb.conf by hand. In Debian I just cllick a few things; it's practically like Windows. Now, that's not necessarily bad, but I liked how FreeBSD installed, gave me a command prompt, and then demanded I learn how to install X, configure apache, etc. Yes, I realize I can do things manually in Debian as well, but the thing is, FreeBSD FORCED me to learn, to do a lot of things by hand, and doesn't that make you more knowledgeable overall? Okay, I suppose this is more of a character flaw I have than anything, but I digress...)

Anyway, Debian is okay and all, but I don't want to abandon FreeBSD, because I really have liked using it. So I'm still going to run it, just virtually. It's still going to be my squid proxy server, and my apache server.

So, what I want to know is, when doing a fresh install, what should I back up from my old server (which may only live a few days longer)? I already have my data, but what about config stuff to reference? Here's what I figured so far:

/etc
/usr/local/etc

And that's about it. I imagine I'm missing something obvious (I've really only been playing with BSD for less than two years) and I'd be very grateful if anyone else had any suggestions.