"If you'd want to delete old iCloud backups to free up more storage space on your iPhone or iPad, take a read on this article," Jim Hamm informs us.
"Looking at my iPhone 6 I saw that 462 MB of data was stored there from my old iPhone 5. I didn't really need that backup anymore, so I could have freed up this storage space if I'd needed/wanted to.
Jim Hamm goes on to say, "Also, as you scroll down the list of apps you have on your device you can stop any of them from being included in future iCloud updates, should you want to. Since I have plenty of storage space available I let them all continue to be included in future updates. But this is good to remember if, in the future, I start running tight on iCloud storage space."