My wife has a 1.33 Ghz iBook G4 running Tiger. It works great, but with her current 512MB RAM, I figured I would install Leopard. Why not, right? Wrong. I cannot find her Tiger Restore disks anywhere! So I am worried that if anything goes wrong, I cannot revert back to Tiger. What do you think, should I even be worried? Is there a cheap place to get a Tiger OS disk to have some piece of mind?