Apple has confirmed that it uses Google's public cloud to store data for its iCloud services in its latest version of the iOS Security Guide last month, as detected by CNBC. Reports that Apple relied on Google cloud services emerged in 2016, but have never been confirmed before.
Apple had previously used remote data storage systems provided by Amazon Web Services and Microsoft Azure. The Apple edition of the iOS Security Guide in March 2017 included Microsoft Azure instead of Google Cloud Platform.
The new edition describes its iCloud service: "Encrypted fragments of the file are stored, without any user identification information, using third-party storage services, such as [Amazon] S3 and Google Cloud Platform."
The report does not clearly indicate whether Apple uses Google's cloud services outside of storing photos and videos, nor does it give a start date for when Apple made the change for the first time.
Apple and Google did not respond immediately to comment.