Real life use of at and cron daemons

[DiggBlu]

I know that the at and cron daemons are used to schedule commands; the at schedules a command to execute in the future and the cron schedules the command to execute repeatedly in the future. I am completely new to Linux and I can't find any examples of some common administrative tasks that could probably be automated by using either the at or cron daemons or similar tasks in a Windows system. Can someone please help point me in the right direction?

[Ricky]

Do you want to know how to use cron or want to know what can be real use of cron ?

For me, I use cron to regularly backup datas on servers. I also use cron at few places to free space used by logs etc. At one place I use cron to run a script which sends email about status or simply called logs to me.

There can be several other uses, depends upon needs.