Deleting iCloud data
Is it possible to delete old information from my iCloud account in order to free up space?
iPhone 14, iOS 16
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If you have iCloud Backups of old devices that you no longer have you can delete them by going (son your current iPhone) to Settings > [username] > iCloud > Manage Account Storage > Backups > [old device name] > Delete Backup.
Also see: Manage your iCloud storage - Apple Support