It's good to know that Apple's announcement that it would be adding end-to-end encryption for iCloud data (such as device backups, messages, and photos) is deeply troubling to the FBI. That means it really works!
From Mac Rumors:
— Read the restiCloud end-to-end encryption, or what Apple calls "Advanced Data Protection," encrypts users' data stored in iCloud, meaning only a trusted device can decrypt and read the data.