Please keep copies of any documents in your classes that you might want to save. It takes a lot of time for you (or me) to go back through all of your classes and save the substantive discussion postings and papers. You will have access to your classes as long as you have your VLS credentials. However, our IT department closes accounts a few months after graduation. It is so much easier to save as you go along.
You never know when you can use these documents for a writing sample in a job application or for a PhD program. Two employers who provide tuition reimbursements ask for samples of work product - just because they are interested in what their employee is studying.
To reiterate Kathy's excellent guidance, maintain an e-file or hard copy file of samples of your work product (including feedback from your professors). These can be used to reflect upon your coursework, reinforce learning, track your progress, and compile a professional portfolio to share with current or prospective employers. Often, employers seek writing samples or examples of your body of work. These artifacts serve as better reflections of your knowledge, skills, and values than a mere transcript or letter grade conveys.