Question : Problem: NTBackup and WD USB drive issue

I have problem with NTBackup and USB external hard drive.
The thing is when try to do backup of my server to external usb drive (WD My Book® Essential Edition) connected to deferent PC  I receive error message. The operation was not performed because the specified media cannot be found.  I know that this drive after while goes to sleep mode so maybe this is problem. I used this command in NT Backup
C:\WINDOWS\system32\ntbackup.exe backup "@C:\Documents and Settings\backupacc\Local Settings\Application Data\Microsoft\Windows NT\NTBackup\data\Friday Differential.bks" /n "Friday Differential.bkf created 2008-09-17 at 14:59" /d "Set created 2008-09-17 at 14:59" /v:no /r:no /rs:no /hc:off /m differential /j "Friday Differential" /l:s /f "B:\Differential\Friday\Friday Differential.bkf" /um

Thanks everyone for help

Answer : Problem: NTBackup and WD USB drive issue

C:\WINDOWS\system32\ntbackup.exe backup "@C:\Documents and Settings\backupacc\Local Settings\Application Data\Microsoft\Windows NT\NTBackup\data\Friday Differential.bks" /n "Friday Differential.bkf created 2008-09-17 at 14:59" /d "Set created 2008-09-17 at 14:59" /v:no /r:no /rs:no /hc:off /m differential /j "Friday Differential" /l:s /f "B:\Differential\Friday\Friday Differential.bkf" /um

According to this, which is most likely in your scheduled tasks.. it is trying to save the the "B" drive as Friday Differential.bkf using the selections from Friday Differential.bks