You can use Helium to do an app/data backup before starting.
Unlocking the bootloader will wipe the phone, so I'd recommend backing up first (there is a red warning about this in the first post of the thread).
Thanks for the suggestion. I meant more along the lines of full system backup of the stock ROM. I'm given to understand that I'll need that if I ever plan to go back/start over if I have any significant issues. Am I wrong about that? I'm essentially just trying to make sure I don't royally screw myself by not researching what I'm doing enough before attempting it and then finding myself totally out of my depth. Any help much appreciated.
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