If you are using the Windows backup utility and reschedule a previously scheduled backup in Windows Server 2003,...
the backup may not run.
According to Microsoft, you should use Scheduled Tasks as a workaround when you have to reschedule a backup.
To use Scheduled Tasks, click start --> run --> control schedtasks --> OK. Then double-click on the backup job you want to reschedule, click the schedule tab and specify the new time for the backup to run. Then click OK, enter the credentials for the logged-on administration account and click OK.
Microsoft also has a hotfix for the problem, which is available by calling Microsoft Support. The tech note on the problem is at http://support.microsoft.com/default.aspx?scid=kb;en-us;902389.
Rick Cook has been writing about mass storage since the days when the term meant an 80 K floppy disk. The computers he learned on used ferrite cores and magnetic drums. For the last 20 years he has been a freelance writer specializing in storage and other computer issues.