[CentOS] duplicate hard drive image

[JC <hiep@xxxxxxxxxx>]

Hi all,

Even though we use linux server, but people still use windows server and 
i'm one of them.  I have windows server and i would like to do back up by 
create its hard drive image.  Does any one have suggest for a software?

I plan to back up every night, so I need some kind of schedule, i prefer 
usb or firewire, my hard drive is 160GB.  Anybody knows how long it takes 
to duplicate 160GB image?  Finally, once i have a backup image, how do I 
restore if my main hard drive fails?

Thank you for all your suggestions.
JC
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