> On December 7, 2022, Apple announced Advanced Data Protection for iCloud, an option to enable end-to-end encryption for almost all iCloud data including Backups, Notes, Photos, and more. The only data classes that are ineligible for Advanced Data Protection are Mail, Contacts, and Calendars, in order to preserve the ability to sync third-party clients with IMAP, CardDAV or CalDAV.
https://en.wikipedia.org/wiki/ICloud#Advanced_Data_Protectio...
> On December 7, 2022, Apple announced Advanced Data Protection for iCloud, an option to enable end-to-end encryption for almost all iCloud data including Backups, Notes, Photos, and more. The only data classes that are ineligible for Advanced Data Protection are Mail, Contacts, and Calendars, in order to preserve the ability to sync third-party clients with IMAP, CardDAV or CalDAV.