-- 다중 볼륨 백업
backup database test to disk='d:\north.bak' , disk= 'd:\north2.bak'

-- format missing
backup database test to disk='d:\north.bak' , disk= 'd:\north2.bak' , disk= 'd:\north3.bak'

-- format 지정
backup database test to disk='d:\north.bak' , disk= 'd:\north2.bak' , disk= 'd:\north3.bak' with format