Hi there, @valerieKT. 

Thanks for following up with us. 

You can condense your data prior to 2020. However, at this time, there isn't a way to maintain your classes. I understand how beneficial this would be for you and your business, so I've gone ahead and submitted this suggestion to our Product Development Team. This way, it can be considered in a future update. 

You can see more information about condensing your data in Use the Condense Data Utility. 

Please let me know if you have any questions or concerns. I'm always around to lend a hand. Take care!