You can no longer use the iCloud Backup feature on older iPhones and iPads running iOS 8 or earlier. Instead, backing up your device to iCloud now requires iOS 9 or later.
Source : Apple Deletes iCloud Backups for Old iPhones and iPads
You can no longer use the iCloud Backup feature on older iPhones and iPads running iOS 8 or earlier. Instead, backing up your device to iCloud now requires iOS 9 or later.
Source : Apple Deletes iCloud Backups for Old iPhones and iPads