Backup/Restore N2E OS X/LINUX
Rule one: Make a backup of your factory fresh Nook ROM.
Linux/Mac: Become root
Boot nook with noogie.img and connect to your computer via USB.
New link here
use df -h to get your nook's /dev/sd? address.
typically something like: /dev/sdb
use diskutil list to get your nook's memory address.
typically something like: /dev/disk3
Once you know the address, unmount the Nook.
Linux: umount /dev/sdb*
OS X: diskutil unmountdisk /dev/disk1
Make the backup
Linux: dd if=/dev/sdb of=my_backup.img bs=1M
OS X: dd if=/dev/disk3 of=my_backup.img bs=1M
After it is finished, double check and make sure the backup img file is exactly 1958739968 bytes long.
dd can wipe your computer's hard drive, so be careful! Make sure your're plugging the correct drives into the command above.
Restoring your N2E to factory-fresh is a simple reversal of the commands above:
(boot with the noogie sd card first!)
Linux: dd if=my_backup.img of=/dev/sdb bs=1M
OS X: dd if=my_backup.img of=/dev/disk3 bs=1M
Substitute sdb or disk3 above with your Nook's actual address.
This wipes your N2E, restoring the specified image file.
Windows users, see the next post.