Date: 02 Aug 1998 10:50:02 +0200 From: Benedikt Stockebrand <benedikt@devnull.ruhr.de> To: Scott <scott@schematix.net> Cc: Nathan Dorfman <nathan@fcc.net>, Andrew Bromage <bromage@queens.unimelb.edu.au>, freebsd-stable@FreeBSD.ORG Subject: Re: CD writers as a backup medium Message-ID: <87u33v939g.fsf@devnull.ruhr.de> In-Reply-To: Scott's message of "Sat, 1 Aug 1998 12:56:41 -0700 (PDT)" References: <Pine.BSF.4.01.9808011254190.295-100000@SchematiX.net>
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Scott <scott@SchematiX.net> writes:
> The 7502 can be found for $269 or less for the bare drive. Its a 4x8 drive
> with 1MB or 2MB cache (can't remember). DAT drives are nice, but the
> drives are quite expensive.
Just for comparison, a Seagate DDS-2 streamer costs about DM 900 ~=
US$ 500 here in Germany. A DDS-2 (90 m) tape is DM 6.50 ~= US$ 3.70.
At my former company we've used these tapes approx. five times before
they were retired. We needed two 90m tapes per night for approx. 7 GB
of data. That's DM 2.60 ~= US$ 1.45 per night on media. Doing five
backups per week we got DM 13.20 ~= US$ 7.25 per week, DM 686.40 ~=
US$ 380 per year on media.
Assuming 11 CD-Rs per night for the same amount of data and cheap CD-Rs
at US$ 1 each you'd pay US$ 11 per night for that backup, US$ 55 per
week, US$ 2860 per year for the media. That's assuming that you don't
have any write faults.
If you did the backup on CD-Rs you'd have to write the nightly backup
to a holding disk and write them out during the following day. You'll
know the US prices of some 8GB of SCSI disk space better than I do.
Looks like the CD-R approach will be a bit more expensive in the long
run.
And then you'll have to change CD-R's every couple of minutes which is
a major pain in the behind.
> Plus, you can't beat the versatility of a CD-ROM.
If you're talking about archival you're probably right. For backup,
especially above the 650 MB limit, you wouldn't really want to try.
So long,
Ben
--
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