So you just want to take a backup of all your databases.
Use task scheduler on the server to create a task that executes sqlcmd which fires off a backup script.
Old thread, same problem:
http://www.sqlservercentral.com/Forums/Topic1014439-24-1.aspx
Have a look at for step by step:
http://www.sqldbatips.com/showarticle.asp?ID=27
SMO and Powershell:
http://www.sqlmusings.com/2009/05/31/how-to-backup-sql-server-databases-using-smo-and-powershell/
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