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iCloud Backups Bypassed iMessage Encryption
- Apple historically stored iMessage and many device contents in iCloud backups that were not end-to-end encrypted.
- That allowed law enforcement to obtain message contents via iCloud backups despite iMessage's E2EE.
Turn On Advanced Data Protection
- Enable Advanced Data Protection to end-to-end encrypt most iCloud data except mail, contacts, and calendars.
- Set a recovery key or a trusted recovery contact when you enable it to avoid data loss.
Metadata And Checksums Still Expose Info
- Apple keeps some metadata under standard protection even with Advanced Data Protection enabled.
- They use checksums and de-duplication techniques that can reveal whether another account has the same file.