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Best way to duplicate HDs



Hi all,

What do you think would be the best way to duplicate a HD to another
(similar sized) HD?

I'm thinking that a live RAID solution isn't the best option, as (for
example) if crackers got in and fiddled with the system, all the HDs would
end up having the same fiddled files.

If the HD is duplicated every 12 hours or 24 hours, then there would
always be a working copy, so if something is detected as being altered, we
could always swap the disks around and get a live working system up and
running almost instantly (unless we detect the problem more than 24 hours
later, and then it would be too late since the HDs already synced).

So... what do you think the best way would be to duplicate a HD on a live
working system (without bringing it down or anything like that).
Performance can drop for a while (maybe do this at 5am in the morning),
but the system must stay up and operational at all times.

Maybe dd... or cp -a /drive1/* /drive2/... or something?

Any suggestions would be greatly appreciated.

TIA.

Sincerely,
Jason




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