I agree with Grytolle as the term backup normally means someone who plays in case others are not able to. If you think differently from some terms, then you have to define them Emperor! Always define the words you use if you feel that there will be a misunderstanding.

If I call Maverick a noob, then I normally am wrong. But when I say "Maverick is a noob" my word "noob" means a guy who owns me and that's why I don't like him.