Sign up at http://www.nikonimagespace.com/ and get 2Gb storage for free. Download the software (Adobe… sigh…) to upload images into the cloud….. very slowly…. but hey it's free and - as far as I can tell - no expiration. If you have a Nikon camera, then download the tool here (http://nikonimglib.com/upgradeutility/) - for windows users just extract the application & associated files into a directory (no installer), then run the exe. Follow the instructions to add the camera to your 'image space'. You should now have 20Gb!
Keep in mind that this is for photos & video only…. so if you want to store other things then services like box etc may be better for you (although nothing to stop you from using more than one cloud service!) and the interface could perhaps do with some work… but again it's free and (as long as the T'c and C's are ok) might be another way of providing an offsite backup for those critical images.
Might as well use mega etc etc as you get more vercatility, better speeds and better interface, if your description is correct.