auto backup query

CREATE  PROCEDURE [dbo].[auto_backup] as
declare 
@DATABASENAME nvarchar (100),
@PATH nvarchar (100),
@zipname nvarchar (100),
@zipname1 nvarchar (100)
SET @DATABASENAME = db_name()
SET @PATH = 'C:\DB_Backup\'+@DATABASENAME
DBCC SHRINKDATABASE (@DATABASENAME)
BACKUP DATABASE @DATABASENAME TO DISK =@PATH WITH NAME = 'BACKUP',STATS = 10
set @zipname = 'Del '+@PATH+'_'+CONVERT(NVARCHAR,(GETDATE()-5),105)+'.BAK'
set @zipname1 = 'Ren '+@PATH+'   '+@DATABASENAME+'_'+CONVERT(NVARCHAR,GETDATE(),105)+'.BAK'
exec master.dbo.XP_CMDSHELL @zipname, no_output
exec master.dbo.XP_CMDSHELL @zipname1, no_output