Can I add iCloud storage amount?
I can’t back up to i cloud because I don’t have enough storage.
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See the following Apple Support article for information on upgrading your iCloud storage plan: Upgrade to iCloud+ - Apple Support
For monthly cost of upgraded storage see: iCloud+ plans and pricing - Apple Support
Also, see the following. If you have backups of old devices that you no longer use, you can delete them to reduce the storage you are using. Manage your iCloud storage - Apple Support