Backing up final fantasy 10
 

How do i copy the game with out having to use a modchip?

How can I get in my house or drive my car without a Key?
Your option is Knife swap method..But be warned though b/c your machine's life is shorten from this method..
You need a mod of sometype to play backups..
That's all I'm gonna say..

you have sort of asked 2 questions there...

how do I back up Final Fantasy 10
answer - http://www.psxcopyworld.co.uk/Tutorials.htm
use PrimoDVD or Nero, decent burner and decent media

without having to use a modchip?
As A03 said, knife trick. Jamming something into your PS2 tray and wedging over a clip and forcing the tray to open/close. Think of opening your front door or car door without the key. Can be done so many times before door is eventually knackered.