Mew phone back up
I just received my new iPhone 11 and it did not back up overnight. I have an error meaaage saying not enough iCloud storage. It used to Replace the old backup...not add it to last back up.
iPhone 11, iOS 14
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Because you have a different device. If you finished transfering data from the old iPhone to this new one, you can delete the old device's backup.
See this support page:--> Remove a device backup from iCloud - Apple Support
Regards
Giulio