Daca va uitati un pic la mesajul de eroare va si sugereaza metoda recomandata:

Msg 3206, Level 16, State 1, Line 1
No entry in sysdevices for backup device 'c:\1.bak'. Update sysdevices and rerun statement.
Msg 3013, Level 16, State 1, Line 1
BACKUP DATABASE is terminating abnormally.

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Cristian Andrei Lefter, SQL Server MVP
MCT, MCSA, MCDBA, MCAD, MCSD .NET,
MCTS, MCITP - Database Administrator SQL Server 2005
http://sqlserver.ro