An old company I worked for used project management software with a check-in/out mechanism for making changes. When you "check out" a project it downloads a copy that you change locally, then "check in" uploads it back to the server. A project is "locked" while in the "checked out" state. We all felt it was an archaic mechanism in a word of live updating apps.
After 10 years of building SPA "web apps", that data synchronization mechanism feels ahead of its time.