I think you'll find that Bust-A-Move 2 isn't protected at all, just use CDRWin to make a backup & all should work fine!!
I've done it & mine works perfectly!!
If you're backing up older games, or even some newer games, & can't find a patch, check PSXCopyworld & look at the protected games list & unprotected games list to see if the game needs patching!!
Good Luck!!