Hi,
I've done a bit of reading on the issue of media type, and would suggest
looking at institutions such as the National Archives, who have made
some nice, easy to read papers on digital preservation:
http://www.nationalarchives.gov.uk/preservation/advice/digital.htm or
for a bit more reading see TASI:
http://www.tasi.ac.uk/advice/advice.html who have a bit more indepth
information.
Basically what we are doing is:
- Saving to a hard drive (not the network)
- Backing images up straight from the digital source (ie camera card) to
a Master CD-r (we are using Delkin preservation quality gold CD-r disks
see: http://www.delkin.com/delkin_products_archival_gold.html) and a
Slave CD-r
- Creating an 'everyday use' regular CD-r for internal use and sharing
- Storing both the Master and Slave CD-r in CD Secol pouches in CD
preservation boxes
- Storing the Master CD-r in fireproof safes away from the main
site/image hard drive
I have not used DVD-r as through reading it suggests that DVD media and
readers will become obsolete far quicker than CD media (I've taken that
at face value, but it seems to have something to do with HD technology
replacing DVD technology?)
The failure rate is always going to be an issue, but making sure that
you don't fill the CD up completely (so space is left on the disk at the
edges) has been suggested as a way to reduce accidental corruption of
files, and storing at suggested temps and humidity levels also.
I think the main thing is to keep several back-ups, don't use 'new'
technologies until they become mainstream, and keep master copies in
secure, controlled environments.
Hope this helps a bit.
Peter
Peter Davies
Favourite Things
Project Manager
-----Original Message-----
From: Museums Computer Group [mailto:[log in to unmask]] On Behalf Of
HARRIS TONY
Sent: 04 April 2006 17:56
To: [log in to unmask]
Subject: Backup strategy/file corruption
Dear All,
In addition to our existing server setup and it's associated backups, we
would like a separate system to backup important RAW camera files and
other critical files, but are unsure of a suitable strategy. Does anyone
have any recommendations, such as desktop RAID hard drives, DVD backups,
something else or just use every available media type!?!
Knowing that 10% of CD/DVD's can fail every year doesn't seem to make
this a great option, however apparently DVD-RAM is more reliable as it
is closely related to MO disks. Any thoughts? Is there a good known
brand of CD/DVD's?
Does anyone have any experience of the Lacie RAID desktop hard drives or
similar? If we used the drive connected to a Mac and had a copy of
DiskWarrior would this give some confidence in the case of file
corruption? Is there a PC equivalent of DiskWarrior?
Finally is there any MAC or PC software that can monitor (image) file
corruption or am I simply asking too much of modern technology!!
Many Thanks
Tony Harris
New Media Officer
Government Art Collection
0044 (0)20 7580 9123
www.gac.culture.gov.uk
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