Backing up entire disk

["clangin@siu.edu" <clangin@siu.edu>]

Greetings,

Is it possible to back up and restore an entire disk?

It seems to me like when the data was restored, that
it would be overwriting the files of active processes,
and I don't understand if that would be possible.

If the above is not possible, would this be possible?
Make an identical second disk.  If the first disk
is corrupted, just swap disks.

TIA.

--Chet



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