The Unix subsystems on Mac OS X were originally written for machines that were typically never shut off. Mac OS X inherits this assumption in version 1.x, and has many system maintenance tasks that are scheduled to run between 3 am and 5 am. In addition, there are scripts designed to run weekly on weekends, and once a month in the middle of the night. If these maintenance tasks are never run (such as on a laptop that is always shut off at night), many log files and system database will grow extremely large or fail to get backed up. MacJanitor provides a way to run these system tasks at the click of a button. Laptop users could click the 'daily' button every morning (or every few days), or office workers could click the 'weekly' button on Mondays.