Before you close a project, archive all the documents and any notes and data that could prove useful. Retain particularly, the lessons learned reports on a shared drive or in a cloud solution. That makes them available to all project teams. Even if you never access it, there’s a need to keep a paper trail of the work done on any project for other people in the organization. This might include legal teams, or HR teams, or even your successor. You never know when someone might have to go back and respond to a question or want to learn how an old issue was resolved.