Free Cron Job Website
If you have had trouble setting up cron jobs to work on your hosting account then I recommend to you this simple solution, WebCron. This free website allows you to setup three cron jobs very easily. Enter the URL location of your script (http://www.yoursite.com/yourscript.php) and how often you want it to run. Simple.
What is a "Cron Job"?
In layman terms its simply scheduling to have a script run automatically for you. The script you write is often in PHP (if your a web developer) and can do any number of things you can do normally with PHP, whether that is backup a database, send an email, backup files to a remote FTP server, you name it.
Cron Job References
Some of these links may make you more confused than before, so proceed with caution. But if you know what your talking about when it comes to computers, these links may provide some interesting information.