Can you just transfer them via FTP using Filezilla?
It's freeware so if that's all you want to do then you're sorted. I'm not quite sure if by 'backup' you meant just copied to your HD or also copied to an external source.
i want a program that can do schedule.
i am not copy everything (the whole vol), just copy the important file.
Find a few backup program but doesn't meet my requirement.