In tip 2265, I described how to schedule a backup without having to manage the media.
Microsoft Knowledge Base Article 300135 contains the following summary:
This step-by-step article describes how to configure Microsoft Windows Backup to run automatically at a scheduled time.
NOTE: Only the basic backup operations are covered in this article. For information about more advanced topics, such as tape libraries and media pools, refer to Windows 2000 Backup Online Help.