Gavib writes:
>> [...]but we're close to the point where a second drive for a
>> mirror is cheaper than the media required to back up the drive to
>> something else.
>
>Ah, interesting point. For fun I just threw together some numbers for
>today's media cost to perform a single backup that new 400GB drive in your
>next PC (uncompressed). I grabbed what looked like relatively cheap media
>prices off of pcconnection.com:
>
>Media Type # of volumes Approx. Cost
>---------- ------------ ------------
>Floppy 277,778 $91,444.80
>Zip disk 4,000 $40,000.00
>DLT 8000 10 $699.00
>DDS 3 34 $441.66
Or DDS 4, 20 tapes (assuming no compression) at about $500, or AIT-II (8
tapes) at $720.00. The time to back up is also a factor. Even the fastest
systems -- DLT, AIT-II and DDS-4 -- will require 20 hours, assuming no
compression.
It almost doesn't matter. If you need offsite backup -- and you do -- the
tapes have a much higher probability of surviving the journey than does
the backup disc drive.
The compression point is interesting: what can take up this much space?
If it's ordinary business records, you can probably halve the number of
tapes and the time/cost estimates given above. If it's compressed video
or audio (an MP3 collection gone out of control), then the worst case is
also the most probable.
-- Bruce
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