There are a few things that can cause iCloudbackup not to restore. One is if there is not enough storage space on iCloudto hold the backup. Another is if there is a problem with the backup file itself.
If there is not enough space on iCloud, you will need to free up some space before you can restore the backup. You can do this by deleting some old files or photos, or by upgrading your iCloudstorage plan.
If there is …