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Date:      Mon, 3 Aug 1998 15:10:27 -0700 (PDT)
From:      Scott <scott@SchematiX.net>
To:        Benedikt Stockebrand <benedikt@devnull.ruhr.de>
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:  <Pine.BSF.4.01.9808031508140.443-100000@SchematiX.net>
In-Reply-To: <87u33v939g.fsf@devnull.ruhr.de>

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On 2 Aug 1998, Benedikt Stockebrand wrote:

> 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.

what someone uses for backing up would largely depend on how much they
backup.

> 
> 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.

just depends on what you have to burn...if you only have 500MB to backup,
CD-Rs would definately be the cheaper way to go. If you have 25GB to
backup, something larger would definately be in order. 

> And then you'll have to change CD-R's every couple of minutes which is
> a major pain in the behind.

at 4x about every 20 minutes.....2x about 40 minutes..



> 
> > 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
> 
> -- 
> Ben(edikt)? Stockebrand    Un*x SA
> My name and email address are not to be added to any list used for advertising
> purposes.  Any sender of unsolicited advertisement e-mail to this address im-
> plicitly agrees to pay a DM 500 fee to the recipient for proofreading services.
> 
> 


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