Apple released macOS 10.13.4 on Monday, April 9, 2018. The update includes support for Messages in iCloud, which keeps all your messages in sync across all your devices, and AirPlay 2, which allows you to control multiple AirPlay 2-enabled speakers from your iPhone, iPad, or Mac.
If you’re planning to install the macOS 10.13.4 update, it’s a good idea to back up your Mac first. Here’s how to back up your Mac before updating:
1. Connect an external hard drive …
