You can create database backups on PROD and restore them on another environment, e.g. TEST. Read more about it here: https://docs.mendix.com/developerportal/operate/backups
What you should keep in mind is that you might have configuration data in your PROD database dump that you might not want on the TEST environment, e.g. email configuration data. In combination with automated processes (scheduled events), this could lead to unwanted situations (e.g. emails send out from TEST which should not go out).