Ken Blake said:
If you are using RAID1 as an alternative to backup, let me
recommend that you do *not* do this.
RAID 1 (mirroring) is *not* a backup solution. RAID 1 uses two or more
drives, each a duplicate of the others, to provide redundancy, not
backup. It's used in situations (almost always within corporations,
not in homes) where any downtown can't be tolerated, because the way
it works is that if one drive fails the other takes over seamlessly.
Although some people thing of RAID 1 as a backup technique, that is
*not* what it is, since it's subject to simultaneous loss of the
original and the mirror to many of the most common dangers threatening
your data--severe power glitches, nearby lightning strikes, virus
attacks, theft of the computer, etc. Most companies that use RAID 1
also have a strong external backup plan in place.
Read my thoughts on backup here:
http://www.computorcompanion.com/LPMArticle.asp?ID=314
Thank you for your concern, but I am very happy using RAID-1 in case of
drive failure. It has saved me twice in the last three or four years, when
a drive has failed. There is no effort involved, and I see no reason to
*not* use RAID-1 for my data drives. Drives are cheap enough these days,
and have such high capacities, that I only need two pairs to put all my
valuable data on. I do not bother doing this for media drives.
As I said before, I also do other things, like I keep my irreplaceable files
backed up on a remote server, owned by a friend, and I also have automated
scheduled True Image Echo Workstation backups done through network, for my
desktop machines, and laptop (through wifi). Only a tiny agent needs to be
installed on them, not the full program. The server can even push the agent
onto the clients. I have very little worry about loss of any important
data, which my living depends on.
And as far as it only being used in corporations, heh, I know many people
that use RAID-1 or 5, with things like FreeNAS or in dedicated NAS
appliances. And if you know the CAD and graphics world at all, the use of
RAID is widespread, on PCs and Mac workstations.
I am thinking of retiring my server, and building a much more power
efficient, slim HTPC/server, and putting all of my data on one of those
Drobo things (after consilidating all the data onto larger drives). Two of
my friends have them, and I am very impressed. The Drobo uses something
like RAID-5, and the sort of redundancy and convenience it offers will make
my data security even more secure and hassle free than my current solution.
I think your suggestion that I back everything onto removable media is
totally unfeasible, even with BluRay, personally. It would take far too
much of my time, and I have far more important things to remember than what
has been backed up or not.
Redundancy for drive failure, along with off-site backup for security, is
the way to go.
ss.