iCloud backups are encrypted. Not all iOS files are encrypted with a device-UID-wrapped key, however. See the iOS Security Whitepaper: https://www.apple

iCloud backups are encrypted. Not all iOS files are encrypted with a device-UID-wrapped key, however. See the iOS Security Whitepaper: https://www.apple.com/ipad/business/docs/iOS_Security_Oct12.pdf https://www.apple.com/ipad/business/docs/iOS_Security_Oct12.... In short, Apple can't read your email backups, and neither can anyone attempting to restore your device from iCloud (they would need your email passwords). iMessage doesn't have the same protection.