Another newbe question
First, I'd like to apologize if those questions were already asked but I couldn't find an answer in the search (probably I'm not familiar with the right terminology)
I'd just bought a NOOK HD+ 32GB and I think about (I'm not entirely sure yet) installing Android CM OS instead of B&N OS. basically, I'd like to try the Android before setting it as a replacement for the original B&N OS. there for I'd like to run the Android OS from the SD card before I'll root the Nook. looking at the web found 3 companies selling Android firmware for rooting and Android OS running from SD card (n2acards, rootmynookhd and another one) but again, as a newbe I'm not really sure how to start and I'm trying to test it in the safest way.
-Is there a bootable "acclaim" version for running from SD card? I've read the "Building a CM10.1 (JB 4.2.x) SD card for Nook Tablet" but I didn't understand if it bootable and if it change something in the original B&N OS.
-Is there a way for backuping/restoring the original B&N OS before starting without modifications?
Thanks in advance for any help.