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Best way to mirror two drives



I just purchased a second 30G drive that I want to use as part of my backup strategy.  I now have two 30G drives in
my computer.  I don't have a RAID card.  I have /dev/hda and /dev/hdb.  What is the best way to mirror /dev/hda?
I have thought of
 
dd
cp
rsync
 
but am not sure which method would be most efficient.  Are there other methods I am leaving out?
 
Lance

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