how do i root my jazz ultratab c725 7 and install and back up the rom

i want to know how to root my jazz ultratab c725 cus it's bugging me that ya couldn't fully get jelly bean on there i found a rom that was made for this tablet that puts android 4.2 on there

http://www.androidtablets.net/forum/android-tablet-q/53050-how-update-jelly-bean-4-1-a-3.html

all so i want to be able to back up the old rom just in case something gose wrong im kind of new at doing this stuff

Model C725
os android 4.0.4
baseband version 1.5
kernel verson 3.0.8+
Build number 20130517 version 6
cpu All winner A13 1.2GHz
RAM DDR3 512MB