I'm quite new to this android ROM thing, but I want to install Cyanogenmod 11 in my S4 mini duos. It happens that I want to make a full system image of my actual android, so that I can make a backup in case I don't like using Cyanogenmod. I've found out that CWM can do that, but the ROM Manager found in Google's app store doesn't officially support my device. Is there an unnofficial install of CWM that works with S4 mini duos? Or is there another way to make a full system image of my android?