declare @filename varchar(1024)

declare @path varchar(1024)
set @path = N'D:\Backup\';

declare @extension_name varchar(16)
set @extension_name = N'bak';

set @filename = convert(varchar(1024), getdate(), 120)
set @filename = replace(@filename, ':', '')
set @filename = replace(@filename, '-', '')
set @filename = replace(@filename, ' ', '')

set @filename = @filename + '_' + convert (varchar(3), datepart(ms, getdate())) + N'.' + @extension_name

-- 得到完整目标文件，数据库将备份到这个中
set @filename = @path + @filename

-- select @filename

-- 开始备份, MYDB 是需要备份的数据库, COMPRESSION 参数表示压缩，可节省磁盘空间

backup database [MYDB] to disk = @filename with noformat, noinit,  name = N'MYDB-完整 数据库 备份', skip, norewind, nounload,  stats = 10, COMPRESSION

-- 删除15天前的备份文件

declare @olddate datetime
select @olddate=getdate()-15

-- 执行删除 (SQL 2008 具备)
execute master.dbo.xp_delete_file 0, @path, @extension_name, @olddate, 1

go