There are a couple of different ways that you can export the data from an Evolution Graph. The most flexible way is with the Export this data in other formats feature that you can access by clicking on the Export icon underneath the Evolution graph. Click here for more information on the export feature.
However, if you would like to retain the graph visualisation, you should export the graph as an image. To do this, click on the Export as image icon , which is shown below every evolution graph. Clicking this icon loads a popup containing the evolution graph in image format. To save this on your computer, you need to right-click on the image and select Save Image As… You can then choose where to save the image on your computer and use it as you would any other image file.