Now, the maximum iCloud storage offered by Apple is currently 2TB and that was the most you could get, but if you want more and don’t want to juggle multiple accounts and issues with syncing, you might want to consider subscribing to Apple One. This is because the highest tier subscription of Apple One, the Premier plan, offers 2TB of iCloud storage.
It should be noted that iCloud storage offered through Apple One is independent of existing iCloud storage you purchased. This means that if you have a 200GB iCloud subscription and purchase the individual Apple One plan that comes with 50GB of iCloud storage, you’ll essentially have 250GB, unless you cancel your iCloud subscription.
This means that subscribing to Apple One Premier and purchasing a 2TB iCloud plan nets you 4TB in total. Apple One Premier is priced at $30 a month and comes with Apple Music, Apple Arcade, Apple TV+, Apple News+, and Apple Fitness+, so if you add a 2TB iCloud plan, priced at $10 a month, you’ll be paying $40 a month for 4TB of storage along with a host of other Apple services.