All you have to do is sign up for OneDrive and activate the auto upload feature for your camera roll sometime between now and the end of September, and you will get 30 GB of free OneDrive storage moving forward (15 GB base and 15 GB camera roll bonus).
If you haven’t created the One Drive account please click the link below to do it. The promotion only runs till the end of September so please hurry.
https://onedrive.live.com/?invref=b8d867c5d7299190&invsrc=90