dd if=/dev/hda

[Charles Menzes <charles@lunarmedia.net>]

when i was working at my last job, i saw a guy doing something of a 
nightly "backup" on his system by doing

  dd if=/dev/hda of=/dev/hdc		

or something along those lines. i am not certain if there were any other 
flags being used or not. regardless, i remember someone in the unix group 
freaking out that it was being done. 
what are the risks of such an action? the guy doing it claimed he was well 
safe since the two disks being "mirrored" were identical, same brand, same 
model, etc... the guy complaining, complained with facts that were frankly 
way past my understanding. can someone comment on the why's not to do 
this? or why its okay.

thanks -c


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