It would be nice if we could export a timestamped png of the saved charts such that the chart is labelled with the collection period and the filename used would allow variables for the date and time (i.e. mychart_%m.%d.%y_%h-%m.png) would then be saved as mychart_10.05.2006_13-57.png.
I agree, would be nice for archiving purposes. So as long as an image with a constant filename is also still exported (for people who built a HTML page around this to display the state of current things on a web page).