Ahhhhh.... Play a backup without a mod-chip???
The easiest way to play without a mod chip is to take your PS2 outside, then take your car and run over your ps2... Then you don't have to worry about playing at all....
COME ON PEOPLE.... THIS QUESTION HAS BEEN ASKED A THOUSAND TIMES.... THE ANSWER WILL ALWAYS BE THE SAME.... YES, YOU CAN PLAY BACKUPS WITHOUT A MOD CHIP (IF YOU WANT TO DAMAGE YOUR PS2) IF YOU WANT TO PLAY BACKUPS AND NOT DAMAGE YOUR PS2 THEN:
BUY A MOD CHIP!