Apple replaced my IPhone 6 Plus in Jan7. Since that time, I've received a nightly message from Apple stating, " Unable to backup due to lack of iCloud storage". A check shows that I have 1.4 gb of unused storage and my phone has not done an ICloud backup since the day before my phone was replaced. I spoke with Apple rep yesterday and was told this was a software issue they had been dealing with. Has anyone else experienced this issue and is there a workaround otter than computer backup?