SQL2005自动备份和自动删除三天前的备份

1 declare @data_3ago nvarchar(50)
2 declare @cmd varchar(50)
3
4 set @data_3ago ='e:\data\'+convert(varchar(10),getdate()-3,112)
5 set @cmd = 'del '+ @data_3ago
6 exec master..xp_cmdshell @cmd
7 go
8
9 declare @data nvarchar(50)
10 set @data='e:\data\'+convert(varchar(10),getdate(),112)
11 BACKUP DATABASE job TO DISK = @data
12 with init