Backup all pictures and videos, not just Camera Roll and Saved Pictures folders
Currently OneDrive will only backup the Camera Roll and Saved Pictures folders.
However, it should backup all pictures and videos that are locally stored on the phone (i.e. pictures received from WhatsApp). This is the last thing that is not covered by the very good Windows phone backup and arguably the most important; losing some text messages is not a big deal but losing pictures is a different story.
In my Windows Phone I have some image albums I want to auto-upload to Onedrive just like Camera Roll or Saved Images!