Backup newbie question

[M-l-G]

I'm completely new to this topic so plz do not blame me for that question. I just downoaded alcohol 120% and installed it. I've read the backup Faq for the different protection methods (SecuRom, Safedisc...)
Now my question:

If I buy a game and want to make a backup, how do I know which protection is used. How do i get to know if Safedisc or another program was used because at alcohol I have to choose one of those programs.

Thanks for your help
Greetz
M-l-G