It’s a good idea to keep a copy of your old scores (and other metrics) for historical purposes. You can download your scores (and other metrics) in Excel via the Reporting tab. Run the “Performance Highlights” report for your portfolio, or create a custom report where you can select the metrics you want.
If you are applying for LEED certification, you should print out your SEP, accessible on the Reporting tab (top right).
***Once the scores have been updated (in August 2018) there will be no way to access the pre-August 2018 scores.