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Making a copy of all the files on your hard drive and storing it on
another partition on the same drive may be useful in some situations, but not when the
drive goes bad.
Given this reality, you must choose another medium to which to back up your files. This
section gives you a brief overview of your choices and includes some suggestions to help
you find the right one for you.
Mirrors and RAID Arrays
A redundant array of inexpensive disks (RAID) setup offers a system administrator a great
opportunity to have a real-time permanent copy of everything on a particular hard drive.
Mirrors are additional volumes that contain an exact copy of whatever data is stored on
the parent volume. Whenever an operation writes data to the parent volume, it is immediately
written to the mirror volume as well. If the parent disk were to fail, the mirror disk
can immediately take over, ensuring that data isn??™t lost. With relatively inexpensive hard
drives available, this can be a great solution because, as we learned earlier, drives will
always eventually fail.


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