You do an image backup called a Nandroid - that will save you current rom with apps and data just the way it is now...so you can revert back.
This will be done in the custom recovery...CWM/TWRP
Thanks I'll look into that, sounds like a nice option
I will have to do some more research into what a custom recovery is first though
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EDIT: Just done some research and all seems fairly simple
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