If you have CM on SD you can restore a backup. But if you only have stock, you must wipe and start fresh.
Sent from my Nook HD+ running CM10.1 on emmc.
It would be too huge, since I have all my apps installed *that would, some not compatible" totaling 22GB. One thing I notice though is the 10.1 apparently changes the sd for internal data installs to the external card. I use the external as a swap for higher def movies, PSX roms, MAME and comics. Having to always leave the same card in is not a practical option for me, so I guess I will stick with 2.1, Nova and the Extras.zip.
I like being able to swap cards, so prefer the storage of app data to remain in the device and is why I got the 32GB model. I am glad I read the emmc thread, since would have missed that and been a major "Doh!" moment for me.
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