Will backup have the same performance?

Hi, its my first post here, and I really like so much this forum!

I was looking for how to make a backup of my Game, because I have a few scratch on the dvd and I realise that I really need a backup.

So, I follow this tutorial: http://club.myce.com/f81/backup-securom-7-2-safedisc-4-7-cds-dvds-203972/ And everything works.

My question is, will this backup .iso has the same performance while I’m playing the game? I read something about Emulation and I’m a little bit confuse, my game (The sims 2) will run like original?