Sounds similar to what Apple’s doing with Catalina. On https://www.apple.com/macos/catalina-preview/ https://www.apple.com/macos/catalina-preview/ they say: De

Sounds similar to what Apple’s doing with Catalina. On https://www.apple.com/macos/catalina-preview/ https://www.apple.com/macos/catalina-preview/ they say: Dedicated system volume. macOS Catalina runs in its own read-only volume, so it’s separate from all other data on your Mac, and nothing can accidentally overwrite your system files. And Gatekeeper ensures that new apps you install have been checked for known security issues before you run them, so you’re always using good software.