Archived Courses (level-4 objects) typically represent the official approved curriculum by a department, division, organization, or accreditation agency. Archived courses don’t often change and when they do, it generally involves discussion with stakeholders and follows an official approval process.
Typically organizations archive a course before it goes through a major revision. For example, a major revision might be to rewrite all course learning objectives or remove a major competency. These archives, over time, will create a longitudinal history of how a course has evolved. It's important to have this historical information as you discuss what you are seeing in your assessment data over time. You may find that significant course revisions did not have the expected outcomes and this makes it easier to revert back to how it was before. If the changes are successful in improving student outcomes, the archive history provides evidence of that to include in your discussions and reports.
Want to know more about archived courses? Check out these articles: