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Date:      Mon, 11 Oct 1999 11:24:17 +0930
From:      Greg Lehey <grog@lemis.com>
To:        patl@phoenix.volant.org
Cc:        Arcady Genkin <a.genkin@utoronto.ca>, freebsd-questions@FreeBSD.ORG
Subject:   Re: Why use tape for backups? (was: backup method reccommendation?)
Message-ID:  <19991011112417.S78191@freebie.lemis.com>
In-Reply-To: <ML-3.4.939605615.2767.patl@asimov>
References:  <87iu4etzlp.fsf_-_@main.wgaf.net> <ML-3.4.939605615.2767.patl@asimov>

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On Sunday, 10 October 1999 at 18:33:35 -0700, patl@phoenix.volant.org wrote:
> On 10-Oct-99 at 18:05, Arcady Genkin (a.genkin@utoronto.ca) wrote:
>> This discussion of backups to tape reminded me that I have always
>> wondered, why do some people chose tape as backup solution for desktop
>> pc's.
>>
>> It seems to me that it's much cheaper, faster, and more reliable to
>> just buy another hard drive and dedicate it for backups.
>>
>> Is there any reasons tapes are a better choice?
>
> A second disk gets you only one generation of backup.  And if
> something catastrophic happens during the backup, it may be
> corrupted too leaving you with -no- backup.

Well, that can happen with tapes, too.

> If you want multiple generations; and/or have many disks or systems
> to backup, you can't beat the price per bit or reliability of tape.

This used to be the correct answer.  I'm no longer sure it is.
Certainly I think that the current generation of tape units is *much*
less reliable than hard disk.  The media are cheaper, but when I
consider the number of DDS drives I wore out doing regular daily
backups, I think that backing up to disk might have been cheaper.

Greg
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