iCloud backup could not be completed on iPhone. I checked and have enough storage space available (2.6GB). I just needed 1.3GB. It has been almost 1 month since my last successful backup.
iPhone 6 Plus, iOS 8.4
"A message might say you're running out of storage, but your device shows there's plenty. There's a difference between how much storage you have on your iOS device and how much you have in iCloud."
From here > Get help backing up your device in iCloud - Apple Support
About Backup and Restore
Solved.
Finally I thought maybe one of the apps has issue and it caused iCloud cannot backup. So I screen print all pages (approx. 200 apps). Then I deleted row of 4 apps at a time, immediately I triggered iCloud backup after each deletion. Finally I nailed the "Asus Aicloud" app that caused the issue. I remembered I changed to an ASUS router and installed the app back in June.
After removed the faulty app iCloud works again.
I wonder how I can communicate this finding to Apple developers.
Communicate it to the ASUS people, not to Apple.
iCloud backup could not be completed on iPhone
