You need to keep reading threads until you're not confused. 'How do I root the phone' has been asked/answered here thousands of times over the past 2.5 yrs, I'm not seeing any particularly good reason why anyone should regurgitate this stuff specifically for you (chances are you'll bork your phone if someone just blurts out a bunch of steps you don't understand).
Much better for you/your phone if you take your time, learn, then do. I've seen hundreds of people exactly like you break their phones (many requiring an expensive service centre trip) who haven't heeded this advice.
P.S - Use descriptive thread titles, 'Help here please' isn't going to get your thread a lot of views given how few people read I9100 Q&A these days.
Edit - No, you can't backup your EFS without root, which is by design. Can you imagine how many people would mess around with system files & bork their phones if this was possible ?
If it's important enough to cause you grief if it's lost, back it up. No excuses
Trolling for thanks is lame
Does Samsung's auto-brightness implementation crap drive you to self-harm ? A solution !
Failure to search is the leading cause of male impotence on XDA
If you don't know how to recover if things go wrong, what are you doing flashing custom roms ?