A file that Apple updated on its website last month provides the first acknowledgment that it's relying on Google's public cloud for data storage for its iCloud services.
The disclosure is fresh evidence that Google's cloud has been picking up usage as it looks to catch up with Amazon and Microsoft in the cloud infrastructure business.
Apple periodically publishes new versions of a PDF called the iOS Security Guide. For years the document contained language indicating that iCloud services were relying on remote data storage systems from Amazon Web Services, as well as Microsoft's Azure. However, in the latest version, the Microsoft Azure reference is gone, and in its place is Google Cloud Platform (Page 53).