mirroring an external hard drive

I have 2 1TB external hard drives, 1 where I keep my music,pics,game books and various/misc crap(my wife calls me a digital hoarder).The other one I use as a backup.

About every six weeks I format the backup and move the files over to it.But it usually takes about 2 days to move everything over.

So I'm wanting to know what software I would need to use to make a mirror of my main external so it would write onto both drives at the same time.

Thanks
 

My Computer

My Computer

System One

  • Manufacturer/Model
    Aleinware Area-51
    CPU
    core 2 extreme x9000 2.8 Ghz
    Memory
    4 Gig
    Graphics Card(s)
    (2) Nvidia 8800m GTX in Sli
    Sound Card
    Onboard RealTek
    Monitor(s) Displays
    42" JVC LCD HDTV
    Screen Resolution
    1920x1080p 32 bit
    Hard Drives
    (2) seagate 7200rpm in RAID 0
    (1) maxtor external 1 terabyte firewire
    Case
    laptop
    Keyboard
    a really spiffy backlit one that i can change color ;>)
    Mouse
    logitech Anywhere Mouse and built-in touchpad
    Internet Speed
    Cable
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