Comment Comment by mrtksn Apple has a list for that: https://support.apple.com/en-us/HT202303These are end to end:Home dataHealth data (requires iOS 12 or later)iCloud Keychain (includes all of your saved accounts and passwords)Payment informationQuickType Keyboard learned vocabulary (requires iOS 11 or later)Screen TimeSiri informationWi-Fi passwordsThe messages also end to end but the backup contains the private key.The moral of the story is that if you want real protection, do local backups. parent mrtksn 6 years ago
These are end to end:
Home data
Health data (requires iOS 12 or later)
iCloud Keychain (includes all of your saved accounts and passwords)
Payment information
QuickType Keyboard learned vocabulary (requires iOS 11 or later)
Screen Time
Siri information
Wi-Fi passwords
The messages also end to end but the backup contains the private key.
The moral of the story is that if you want real protection, do local backups.