could the script be overwriting the same backup file with differnet databases?
ie the db "Dictionary" gets backed up to C:\Data\Backup.bak, and then the database "SandBox" overwrites teh exact same file C:\Data\Backup.bak with it's backup, instead of being named to match the db?
without the script we can only make guesses, but it's most likely a problem int he script...bad path, overwriting the smae file, appending too the same file, or something.
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