Storing /etc in a repository

I'm thinking that I should start being a more responsible admin of my
server -- I've run into situations before where I've made a change
that has broken something and I have wished like hell that I could A)
remember what it was and B) restore it to a working state.

So, in that vein, I have a subversion repository that I'd like to be
able to keep my entire /etc tree in. Or at least as much of it as is
reasonable to do so.

How can I go about this, though? I can check it in, but that's going
to A) be prohibitively large if there are unnecessary binary files in
there and B) I don't know how to convert /etc to a working copy
without deleting it all -- and since the repository is on the same
system (with the apache server, etc...) I'm not sure if this is even
possible.

I hope that someone else here has done something like this. Should I
maybe set up a secondary repo on another system for this? I don't
really have one to work with at the moment, so I'm not sure I can, but
if it's the only way I'll have to do it. I'd prefer a one-machine
(different physical drive, so hardware redundancy == taken care of)
solution.

-- 
Chris R.
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