This needs to be run on the SQL server, or you need to add a -S SERVERNAME to the OSQL statement ... such as:

@OSQL -E -S SQL01 -Q "backup database BESMgmt to disk = 'C:\BlackBerryDBBackup\backup.bak'"

REMEMBER: You need to make sure though that you run the script as a user that has permissions on the database.

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