back up copies

[falcon33]

Hi, I need help on doing back up copy of "the sims" I have nero burning & use that for other back ups. I have been round site but totally confused(total newbie) I have been to game index, & downloaded something under the sims, but then what?? can not open with anything.
Please, please point me in right direction, incidently would rather have freeware, is there anything like clone dvd?
Thanks a million.