It says can’t be backed up cuz no storage
It says I can’t back up my phone no storage
iPhone 11, iOS 14
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If you're trying to back it up to iCloud, perhaps your iCloud storage is not enough.
Just to better clarify, read this support page:--> What's the difference between device storage and iCloud storage? - Apple Support
If necessary, see these support articles to increase your iCloud storage:--> Upgrade to iCloud+ - Apple Support, and/or this:--> iCloud+ plans and pricing - Apple Support
Regards
Giulio