Snapshots capture the state of a release or activity at a specific moment in time.
You can create snapshots of releases or activities, display existing ones for consultation, and compare different snapshots. You can also restore a snapshot or release if you have the appropriate permissions.
Each release or activity can contain many snapshots. When you consult a snapshot you cannot edit any of the project elements; you must return to the current state to do so.
Also, Decision Center automatically creates snapshots in some situations.