Ever since I upgraded to iOS8, my iPhone has told me that I have to buy more storage to back it up. However, I still have 827 MB available and the next backup only requires an additional 100 MB of storage space. The additional space is needed to process the back up and not to actually store it.
Hello, pankeyman.
Thank you for visiting Apple Support Communities.
The article linked below provides a lot of general troubleshooting tips that will help resolve most issues creating an iCloud backup, and it links to another article that provides troubleshooting suggestions for specific backup alert messages.
Get help creating an iCloud backup
http://support.apple.com/kb/ts3992
Cheers,
Jason H.
Why do I have to buy more storage?
