Thanks for the reply Mike. Would the unknown backup be the one I pull off the car?

I want to send my current unknown tune to be modified (bought 2001 6m vette, don't know its' history). Not sure exactly how to do this. If I read correctly, I have to load a tune from the predator to get a copy of the current tune? Then send a copy to the tuner and put the same copy back in PCM till ...