How many save files can you have for Marvel Ultimate Alliance 2 for Wii?

So, I have MUA 2 for the Wii, and my roommate already has a saved file, but I wanted to start a new one. Every time I try, it warns that its gonna overwrite the auto saved data... and I don't want to erase his game! Is it possible to have two saved files in the game? I know you can do it in the XBox 360 version...