Apple Confirms Some Encrypted iCloud User Data is Stored on Google Cloud Platform - MacRumors
How to Set Up iCloud on iPhone & iPad: iCloud Drive & More
iCloud by Apple
How to Set Up iCloud on iPhone & iPad: iCloud Drive & More
All URLs Opener for Safari by Yoshiko Sato
Apple iCloud Wiki
Focus On: Cloud Storage: Cloud Storage, ICloud leaks of celebrity Photos, Google Drive, Content delivery Network, Streaming Media, Dropbox (service), Data ... OneDrive, ICloud, Mega (service), etc. - Kindle edition by Wikipedia