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Backups run fine but thursday log blank

Im running NT backup and the backups to tape run fine  and they log fine except on Thursday. Ive deleted and recreated the job and I get the Issue only on Thursdays. What could be causing this?
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level9tech
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level9tech
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alfalfa6945Commented:
When you go to "scheduled tasks" and view the properties of the backup task, is it set to "daily" and  "every 1 day"?
On the "Settings" tab, is the "Stop the task if it runs for" set to a low number or something higher like 72 hours?
Also, does the backup throw an event log item during the time you have the backup scheduled?
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level9techAuthor Commented:
The backup is a weekly backup that is set to run every Thursday on to tape.  

By default the task is set to stop after 72 hours.

Event Viewer: Under the system log : it shows that about a half hour into the job the removable storage service entered a stopped state.

under the application log:  at the same time removable storage is stopping I see the following event ,  
Event id : 1524
Windows cannot unload your classes registry file - it is still in use by other applications or services. The file will be unloaded when it is no longer in use.  

Any Ideas ?
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alfalfa6945Commented:
Do you have any application on this machine that runs on Thursdays, ie weekly virus scan?

What it soulds like is that because the ntbackup couldn't get a lock (maybe because of a running program accessing files?) it will fail. I'd look to the scheduled events, failing that some other program that is running at the same time (again, likely a weekly update of some sort). Look to the event log, system and application for items running just before your sceduled backup.
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