How to back up your Nikon camera settings by Steve Perry (backcountrygallery.com):
Stuff happens.
You send your camera in for repair and it comes back reset to factory defaults. You mess around in the menus, things get out of hand, and you can’t get back to the way things were. You get a second identical body and want a quick way to get your settings from one camera to another.
Well, if you’re using a mid-range or pro-level Nikon body (sorry, this doesn’t work for the D3xxx and D5xxx series), then you’re in luck. You can save and backup your camera settings and easily get things back to normal when “stuff” happens – or when you want to copy the settings to another identical body.
Check out the video for everything you need to know – from backing up to saving the data somewhere safe – it’s all covered.
Please note that in addition to the items mentioned in the video, the user settings (U1 and U2) are also not saved with this procedure (no other way to do it either, as far as I know).