DECLARE @name VARCHAR(50)
DECLARE @path VARCHAR(256)
DECLARE @fileName VARCHAR(256)
DECLARE @date VARCHAR(20)

SET @path = 'C:\Backup\'
SELECT @date = CONVERT(VARCHAR(20),GETDATE(),112)

DECLARE db_cursor CURSOR FOR
SELECT name 
FROM master..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 + '_' + @date + '.BAK'
    BACKUP DATABASE @name TO DISK = @fileName
    FETCH NEXT FROM db_cursor INTO @name 
END  

CLOSE db_cursor  
DEALLOCATE db_cursor