You will get this issue when you are restoring your device from an iCloud backup. There are many reasons that you might not be able to select an iCloud backup from an iOS device. The first reason is, may be you have never successfully made an iCloud backup of your iOS device. If you do not know how to backup your device using iCloud, then you can follow the link provided here.
The second reason is, may be your device is running an older version of iOS and need to be updated. An another reason may be your iCloud backup might have been created with a different Apple ID or you have not backed up in 180 days. Read the iCloud terms and conditions, Apple reserves the right to delete the backups associated with the device if you have not backed up your iOS device for 180 days or longer.
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