Necessary features would be organized folders or tabs, the ability to back it up (as easily as possible), I need to be able to draw diagrams or sketches and insert them into the notes.
  I would also like one that can translate my handwriting into text, but if that's not available on the apps with the other features, I can use a keyboard.
  I'm using this for class, so it must be able to take lengthy notes (not looking for a checklist).
  Free or paid apps are both acceptable.
  >>> Need a note taking app for my Kindle Fire HD. (Android app)?