my question is: If i use a copy software, do i also need a modchip to play my backups on my ps2. could anyone please explain
Without any kind of modifications, your PS2 backups are useless. That being said, you'll need to have your PS2 modify (i.e. chips or swap magic disc + fliptop) in order to successfully play any PS2 backups (burned games). By the way, this forum is only for Nero.