There's also the power aspect.... spinning disks cost a lot in 
electricity over time.  A tape on a shelf does not. ;-)

At 04:23 13.6.2008, John Drescher wrote:
>---------- Forwarded message ----------
>From: John Drescher <drescherjm AT gmail DOT com>
>Date: Thu, Jun 12, 2008 at 10:23 PM
>Subject: Re: [Bacula-users] Why do people use tapes?
>To: Kendall Shaw <kshaw AT kendallshaw DOT com>
>
>
>On Thu, Jun 12, 2008 at 10:03 PM, Kendall Shaw <kshaw AT kendallshaw DOT com> 
>wrote:
> > I suspect this is going to be a silly question. Since disk drives are
> > cheaper than tapes, I think. Why do people use tapes rather than hotplug
> > disks?
> >
>Disks are cheaper than tapes if you are only backing up a few TB. Any
>more than that disks become more trouble than their worth. Disks are
>also less reliable than tape so you have to backup your data several
>times and you can not store disks away for more than 1 year and be
>assured that they will be readable when you need the data. Disks also
>have a shorter lifespan than tapes. I would never trust my valuable
>data on a disk that is more than 5 years old while a tape this would
>be just fine. For more reasons look at the archives. This comes up
>every few weeks.
>
>John
>
>
>
>--
>John M. Drescher
>
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