Emulation -- Non-emulation. What's the difference?

I don’t understand why some people say they like the words “without emulation”, because i don’t know what emulation is. I see in alcohol 120% that i can choose securom or any other protetion emulation but what is wrong with that?

It means you need Alcohol installed to use the backup, i.e. you can’t install it on any computer like you could with the original.

Did someone say “emulation”? Excuse me for a moment, :Z

If you need emulation then it is not a 1:1 back-up.