To take complete back up of SQL in single code

DECLARE @name VARCHAR(100)
DECLARE @path VARCHAR(256)
DECLARE @fileName VARCHAR(256)
DECLARE @fileDate VARCHAR(20)
SET @path = 'G:\BACKUP'
SELECT @fileDate = CONVERT(VARCHAR(20),GETDATE(),112) + '_' +REPLACE(CONVERT(VARCHAR(20),GETDATE(),108),':','')
DECLARE db_cursor CURSOR FOR
SELECT name
FROM master.dbo.sysdatabases
WHERE name NOT IN ('master','model','msdb','tempdb')
OPEN db_cursor
FETCH NEXT FROM db_cursor INTO @name
WHILE @@FETCH_STATUS = 0
BEGIN
SET @fileName = @path + @name + '_' + @fileDate + '.BAK'
BACKUP DATABASE @name TO DISK = @fileName
FETCH NEXT FROM db_cursor INTO @name
END
CLOSE db_cursor
DEALLOCATE db_cursor