To manage complexity related to automatically saving an electronic document while the electronic document is collaboratively edited, an end user application running on a local client computer, while participating in collaborative editing of a shared electronic document, is configured to automatically save the electronic document based on both local user activity and external user activity received from a collaboration system on a server computer. The collaboration system implements a save protocol that maintains consistency of the electronic document among the shared storage, remote client computers and the local client computer. The local client computer determines a save interval based on information about external user activity through the server computer, the activity of a user of the end user application on the local client computer. The performance specifications for local and shared storage and the computer network also can be considered.