尽管对于经常关闭的系统来说，Cron会造成一些严重的问题，但是，对于经常运行的作业，比如远程邮件服务器上每小时进行一次的新邮件检查，Cron仍然是一个重要的工具。

Although Cron has serious problems on a system that is shut down regularly, it is still the tool of choice for jobs that run frequently, such as hourly checks for new E-mail on a remote mail server.

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当anacron运行时，它检查自作业上一次运行以来是否已经经过了所需的天数，如果需要，就运行作业。

When anacron runs, it checks to see if the required number of days has passed since the job was last run and runs it if necessary.

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考虑添加cron作业来提醒自己每月至少检查一次备份。

Consider adding a cron job to remind yourself to check your backups at least once per month.

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