How do I stop ntbackup from doing an "estimate" before actually backing up files?

I am using my XP computer to backup files that are located on the server.  It seems, when ntbackup is run, it goes through a "Selection process" to calculate the number of bytes for the backup.  

I do not want it to calculate anything, other than starting the backup of files immediately.  Is there a switch I can use to turn off this calculation process?