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backup database weds_v4 TO DISK = 'D:\KQbak'
backup database weds_v4 TO DISK = 'D:\KQ.bak'
declare @data nvarchar(50)
set @data='D:\KQbak\'+convert(varchar(10),getdate(),112)
BACKUP DATABASE weds_v4 TO DISK = @data
with init
backup database weds_v4 TO DISK = 'D:\KQ.bak'