Mariner Software StoryMill for Mac - Manual (Page 65)

Snapshot preferences
Check Create Automatic Snapshots for Statuses to have
StoryMill automatically take a snapshot of your text when you
assign it a status. Choose which status to take automatic snapshots
of from the list below.
Changing this preference will not create snapshots of text that
already has been assigned the status you choose. You will have to
assign the text the selected status after you have enabled this
preference for it to work. To take a snapshot of your existing text,
choose Tools→Snapshots→Take Snapshot or simply hit ⌥⌘S.
Click the + button to add a new status (or the - button to remove a
selected status.)
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