This would be for Stock roms not rooted. I noticed Titanium said root on the app. And I'm still not to sure abt CWR, I just used it by following directions to the tee, to root my NC.! Not sure how to use it other wise.
For stock roms you are going to have to wait until B&N releases a market as far as anything easy like Titanium Backup since there is no default way to add apps. The only other option you have is manually moving files from you Nook to your PC to back them up.