How "much" do you keep under version control?

[eluser]drewbee[/eluser]
I keep everything; Even though CI is nice enough to have earlier version's available for download, what happens if you make a core hack, or something similar?

In general, I keep everything (including graphics) in subversion. A little over zealous, I am sure, but I know if something were to happen version'ing has my back

Another scenario could be that you are getting ready for a big CI core update, and as you update everything for some unknown reason everything fails. It would be a good way to back-track the mistakes.

My vote is for all in...