Today, Apple released the latest update for macOS. High Sierra 10.13.5 primarily adds Messages in iCloud support, but it also includes some enterprise and security updates. Users of supported Macs can download and install it from the Mac App Store now.
Messages in iCloud has been in the works for a long time, and it has appeared and disappeared from various beta releases of Apple software. It was added in iOS 11.4 earlier this week, and now it's supported on Macs. The feature allows you to store communications you receive and send within the Messages app—plus associated file attachments—in iCloud to save space on your local device. It also means that changes like deleting messages are propagated across devices, and a new Mac that is logged into your iCloud account will immediately have access to your Messages history.
Note that this feature will require you to have some free storage in iCloud, as that service comes with a fee that scales based on the amount of storage you choose.
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