Is Snapshots and restore functionality of systemd still applicable
In the chapter - Ch. 39. System Init: systemd, SystemV and Upstart > 39.6. systemd Features
"Supports creating snapshots and restoring of the system state" is mentioned as a feature. I could not find any documentation related to snapshot with systemctl. When I run 'systemctl snapshot' on my Ubuntu18.04, I am getting error "Unknown operation snapshot.". Can someone provide documentation links or man pages that would be helpful.