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SQL Server backup failed - 2 media families expected

Our automated backup is failing. When I try to create a backup manually I get the error message below which refers to media families. The SQL server is 2008 standard (version 10.0.2714.0 according to the properites window). It is running in a virtual environment. Automated backup was crteated using the maintenance plan wizard. By manually I mean from the Tasks | Backup option in Management Studio.

This is the message:
 
Sysentem.Data.SqlClient.SqlError: The media loaded on "F:\Backup\Links of London\Links of London_backup_2012_03_23_060000_8777321.trn" is formatted to support 1 media families, but 2 media families are expected according to the backup device specification. (Microsoft.SqlServer.Smo)
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Blim2
Asked:
Blim2
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1 Solution
 
Blim2Author Commented:
I'd like to update my [problem. I am now getting this error message:

System.Data.SqlClient.SqlError: A nonrecoverable I/O error occurred on file "F:\Backup\Links of London\Links of London_backup_2012_03_23_080000_7357745.trn:" 112(failed to retrieve text for this error. Reason: 15105). (Microsoft.SqlServer.Smo)

I think the previous error may have been due to having two backup file names in the Backup To window. Sorry for the confusion.
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Blim2Author Commented:
I may have solved this myself. I think the problem was that I did not delete an existing file name from the Backup To window. When I added another of my own I got the 1/2 media families supported error. When I left the filename that was already there, presumably created by the maintenance plan automated backup, I got the I/O error. When I deleted the file name that was already there and added a single, new, name, the backup started and is now still running.

I'm guessing the filename that was already there was for an existing backup file and the I/O error meant that the system could not overwrite this file. Possibly a more meaningful error message would have helped here!

How do I end this Experts-Exchange question. I don't think I should give the points to myself - doesn't seem fair?
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EE_AutoDeleterCommented:
Because this question has no expert participation and is over 21 days old, it would have been deleted automatically, but you have posted information yourself making this PAQ-worthy.

EE_AutoDeleter
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