The New Snapshot Command
The New Snapshot command opens a dialog in which you define of a snapshot An immutable (frozen, static) stream that captures the configuration of another stream at a particular time. A snapshot cannot be renamed or modified in any way. of the stream you selected.
In the Stream Browser, right-click a stream and choose New Snapshot from the context menu. [note ]
The New Snapshot dialog is identical to the New Stream dialog, except that:
The stream type Snapshot is preselected.
You must specify a basis time (the None radio button is disabled).