DECLARE @name VARCHAR(50) -- database name
DECLARE @path VARCHAR(256) -- path for backup files
DECLARE @fileName VARCHAR(256) -- filename for backup
DECLARE @fileDate VARCHAR(20) -- used for file name

-- specify database backup directory
SET @path = 'E:\SQLBackup\'

-- specify filename format
SELECT @fileDate = CONVERT(VARCHAR(20),GETDATE(),112) + REPLACE(CONVERT(VARCHAR(20),GETDATE(),108),':','')

DECLARE db_cursor CURSOR READ_ONLY FOR
SELECT name
FROM master.dbo.sysdatabases
WHERE name NOT IN ('master','model','msdb','tempdb')  -- exclude these databases

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