Sorry, let my try to say that a little more clearly.
It doesn't matter what save setting you have, the game still autosaves. If you're not using realistic save settings the autosaves still happen, you just won't see them in game.
You'll find them here:
C:\Users\YOUR USER NAME\Documents\Mount&Blade Savegames\Native
Rename them to the name of your normal save and replace it, then load the game, it'll load the autosave.
Make sure you back-up the files before trying this though, it's been a long time since I've tried it.