I shall mention something I have just observed, something that I'll describe as a quirk . . .
Having 'scrolled back in time' to review some earlier events, I decided to stop recording and close the utility. As I have the 'snapshot all active graphs upon closure' function configured, the graphs were duly created. On checking the contents of these last snapshot graphs I discovered that they were of the period 'back in time' and not of the current period.
My conclusion, therefore, is that the snapshot function will create an image of the currently displayed range regardless of the time-frame.
I wonder what happens if one is looking back into the past at the precise moment when an automagical snapshot is taken? It needs to be tested but is somewhat difficult to set-up . . .