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On 17.03.2010 18:18, David Dyer-Bennet wrote:
>
> On Wed, March 17, 2010 10:19, Edward Ned Harvey wrote:
>
>> However, removable disks are not very
>> reliable compared to tapes, and the disks are higher cost per GB, and
>> require more volume in the safe deposit box, so the external disk usage is
>> limited... Only going back for 2-4 weeks of archive...
>
> Last 5 times I checked, tapes were vastly more expensive than disks, even
> if you ignored the drive cost. Let's see...currently buy.com lists an
> lt30 cartridge at about $25, for 400GB; a 2TB drive is about $170. So
> yeah, they're a little cheaper than disk now (IF you ignore the drive
> cost; the cheap ones seem to be around $1800).
>
> I had a very satisfactory QIC-60 tape streamer in the 1980s, and a couple
> of rather unsatisfactory DAT drives later. I've been backing up to disk
> since then, seems to be a lot easier, quicker, cheaper, and more stable,
> on my scale. When you go to much bigger setups, the trade-offs change;
> the value of the space in the safe starts to show up as significant, the
> drive cost becomes less of an issue, and so forth.
Please, don't compare proper backup drives to that rotating head
non-standard catastrophy... DDS was (in)famous for being a delayed-fuse
tape-shredder.
//Svein
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