I define a backup task form the SQL Server 2008 Management Studio. The task creates backup files with name db_backup_YYYY_MM_DD_HHMMSS_ID.bak
Is there a way to change the format. I'm interestet of the weekday db_backup_weekday.bak
I don't know that you can do this via a maintenace plan. You will probably be able to do this if you write your backup via a script.