The quotas mini-course is designed to help you implement quotas for users and groups. Quotas are a way to guarantee resources for your users. The guarantee of resources to your users is fundamental to good system administration. When users run out of space there is always trouble and you can be sure as administrator that trouble will be pointed at you. Whenever you implement quotas with users it is a good idea to create soft limits which provide them a warning for 7 days but during that time they can still save.