I have a lot of trouble backing up to the cloud. When you delete off the phone, it deletes what is on the cloud. One thing really helped me was to reset the phone. I backed up first by locking the phone while it was plugged in on wifi. I deleted my content from the cloud before finishing my reset. Then I reset it and restored all the settings from my backup. That actually created space. Also, I find it easier to delete from the cloud then the phone & I think reinstalling everything just cleaned it up in general.