how to make a copy of linux harddisk to another harddisk dito copy

hi there

 

can any one tell me how to make a copy of linux harddisk to another harddisk dito copy. like how we are making it in windows enviroment that just plug the other hdd and from windows copy and paste all the files to the other hdd. even it will copy the system files. how can we do that in LINUX........

 

 

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