Well you can always Odin back to stock than let it boot. Sign in and all that. Than hop back in download mode Odin the cf autoroot file to reroot. Then grab rom installer to flash recovery (like in my tut) then make your backup. Of course you'd want to backup your current rom and put that on external sd. This way oOdin won't wipe it off internal.
After making a good stock (rooted) backup simply flash your carbon backup.
*So far as the theories of mathematics are about reality, they are not certain; so far as they are certain, they are not about reality.
*Do not worry about your difficulties in mathematics, I assure you that mine are greater. - Albert Einstein (1879-1955)