cron job for a SQL function???

[ATVTorture]

Is there a way to create a scheduled task that will run a SQL query. I would like to create one that will run on schedule a SQL function that, at say 3AM (a low user load time), that will make a copy of my database with a date and time stamp on the name it saves. I can handle the date and time stamp on the file name with SQL. I just need to know if I can automate the SQL function.

Thanks!
Buster