Since upgrading to iOS 9 my iPhone 6 Plus backup has got huge (used to be about 2.2GB, now about 4GB) and it keeps growing. I also can't delete the backup from the iPhone (I get a weird error message) Does anyone else have this issue? I'm getting emails from iCloud saying my space is almost used up. I guess I'll switch back to iTunes backups and maybe go a restore. Very odd though.