Linux® ordinarily uses Cron to automatically perform routine system maintenance, such as rotating log files and updating spam filtering rules. This works well for servers and other systems that are powered on 24/7. If, however, you want to save power by shutting off the computer when it's not in use, as is common for desktop and laptop systems, Cron can't run. Not running Cron routinely can result in monstrously large log files and other problems. The Anacron utility provides a solution, enabling the computer to run regular maintenance jobs whenever the computer is powered on, even if those times are unpredictable.