Games : Where are my Saved Games kept, and can I back them up?

I'm intrigued by Pillars of Eternity's Trial of Iron mode (essentially, IronMan mode, in which, to reinforce Permadeath, the game creates only one save file, and deletes all old save files each time a new one is created, as well as on character death).

Thing is, what with the game being so new, I'm a little twitchy about losing my ironman run to some manner of bug. I'd like to be able to keep a backup copy of my save periodically. Y'know, for insurance purposes.

Thing is, I can't figure out where my saves are stored. For that matter, are Trial of Iron saves stored differently, and/or protected against this sort of 'abuse' in some way?