It's already well-explained in the linked article:
> OpenSUSE MicroOS has a read-only root file system, using Btrfs. Transactional updates are handled by a SUSE-specific wrapper script around the package manager zypper, transactional-update. This creates a new Btrfs snapshot of the root file system and then performs an update of the system. If the installation was successful, the script marks the new snapshot as the default snapshot. On errors, the snapshot is discarded and the previous one remains as the default. A reboot activates the new snapshot.
My comment above was saying that you don't have to use MicroOS per se to get this. A regular openSUSE install supports the transactional server role that does the same thing as MicroOS.
