question on deadly alliance

Well sort of.

Here is what I mean in arcade (With a profile), you can quit it (during your playing time), to save or beat arcade and it'll autosave.

I hope that helps you with your problem.

Well sort of but not really.

It will "save" in game terms meaning it will register your kill/loss ratio etc. But you cannot begin arcade again from the point you left off. Arcade is only 8 guys long though, it doesn't take that long to get through that.