Along with key HomePod improvements, Apple introduced Messages in iCloud with iOS 11.4. It’s a useful feature designed to store your Messages and attachments in iCloud, but enterprise users should think twice before enabling it.
Security is everything
I’m not saying iCloud is not secure — so long as you use a six- or more digit passcode or (better, but more awkward) an alphanumeric passcode, it’s highly secure. I’m reasonably confident a strong password, Apple’s own systems. and its insistence you use two-factor authentication is enough for most of us.
Source: Computerworld.com | Security