Can't backup iPad, iPhone5 or iPhone6 after iOS 9.2 update
My wife has for some time needed to reset her iPad to scratch because it is getting slow. Therefore I took backup of her pictures to the computer the other day and removed the iCloud photo backup to make room for the backup of the content on the iPad. I updated to iOS 9.2 this I shouldn't have done since after this none of her phones and the iPad won't backup. There is sufficient space on iCloud since the old backups are deleted. But it keep saying right at the end of the backup cycle that there is not enough space available and that I should upgrade the storage plan or delete content. Nevertheless when I look into iCloud it tells that 1.5 GB is in use from backup, but I can't delete the older backups here, anyway that leaves me with 3.5 GBs free space.
Please help
iPad 2, iOS 9.2