[Q] How to Nandroid my Samsung galaxy Core i8260 topic

Hello
I want to make an image Back-up of my Core and I cannot find something!
I tried the search but I couldn't.
I tried also the rom manager but it does not support my Core.

I want to make this image back up so I can go back if i install an other ROM.

How can I do this?

I hope you can help me!!

(I have already succesfully rooted my phone)

Thank you for your time and help!