If you want to save all of the activity descriptions, rubrics, and learner data from your institution's courses, you can export your data in one step! Note that only Owner and Admin roles have access to this, but Instructors can request this export from their Owners and Admins.
To export your data from your institution, you can go to your Admin overview page (here's how to find it). Under Settings, scroll down and you will see the option to "Export all data".
You'll receive an email with a zip folder with activity descriptions in .html format and any course data and rubrics in .csv format.