Backing up NAND on 2.1.0-4E

I have a "new" Old 3DS that's on 2.1.0-4E and I want to back up the NAND before doing anything else. I don't want to use a NAND mod as I want this system to be MINT.

I have Cubic Ninja, if thats any help. The browser was already installed but Gateway or Decrypt9. won't load :/