Apple's iCloud cloud storage uses Google Cloud Platform to store data
According to Apple's updated documentation for iOS security (as of January of 2018), data stored by the company's iCloud service is currently stored on both Amazon Simple Storage Service and Google Cloud Platform servers.
Previously, Apple had a partnership with Microsoft that stored iCloud user data on Microsoft Azure servers, but references to this have been removed in the January 2018 security documentation for iOS 11.
If you're searching for alternatives to iCloud in light of this shift from Azure to Google Cloud Platform, AlternativeTo.net is the right place!
iCloud on AlternativeTo
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Store email, contacts, calendars, photos, music, books, apps and more in the cloud and access them on all your devices. iCloud also provides collaborative services for task management and notes and productivity apps for text documents, spreadsheets and presentations.