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

SET @path = 'E:\MSSQL\BACKUPS\'  

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

 
OPEN db_cursor   
FETCH NEXT FROM db_cursor INTO @name   

 
WHILE @@FETCH_STATUS = 0   
BEGIN   
       SET @fileName = @path + HOST_NAME () + '_' + @@servicename + '_' + @name + '_' +  CONVERT(varchar, GETDATE(), 112) + '.BAK'  
       BACKUP DATABASE @name TO DISK = @fileName  

 
       FETCH NEXT FROM db_cursor INTO @name   
END   

CLOSE db_cursor   
DEALLOCATE db_cursor