iCloud backup message "The last backup could not be completed"

Try turning off some items for back up in a pattern to try to establish if your problem is being caused by specific data on your device.

Being able to back up to the cloud can be very useful, especially if you don't have access to a computer or have infrequent access to one, however unless you specifically need to use iCloud for back up, you will find backing up to iTunes significantly more convenient and possibly more reliable.

More about iCloud v iTunes Back Up

me too. iphone 6s plus 128. 9.0.2

Same issues .... iOS 9.02, AT&T, iPhone 6+, 64GB ..... 50gb iCloud storage with 32gb remaining. My iPad works just fine ....

Originally it said my most recent backup was only 0gb. I deleted it and it finally let me make a new backup (got numerous error messages saying it can't delete it, I was persistent and kept hitting retry, and it finally deleted after about 20 clicks). Will try deleting this one and try backing up.

mine was fixed by wiping phone to new, then restore from icloud (erase phone again).

i still there are issues with icloud.

i have ipad 3g and iphone 6s and only icloud (no itunes) creating a note, contact, etc. works both ways...sync to devices.

only new contact created on phone will not go to icloud.

also, some apps, like FileBrowser, are not showing icloud folders...some wil show them.

i do not have icloud space problem, if you do that will cause problems.