In order to do this, however, a user will need to use Wi-Fi services. While there is no official word from Apple why they did not make the service available for cellular users, it does mean that people will not find themselves with hefty cellular charges for performing a full backup. While it is not possible to perform a full back up, it is however possible to back up some files and media.
iCloud Drive
iCloud Drive is the name for Apple’s online storage service, which makes it possible to access files from all of your Apple devices. While it cannot perform a full iCloud backup, users are able to upload some files and media to iCloud Drive from their device without being connected to Wi-Fi. All users get 5GB of storage for free, but subscription fees allow you to upload more.
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