Archive & Backup Strategies SVC Class Notes: Jan 19-20, 2005

SVC Class Overview: Archive & Backup Strategies for 2005.

[The following are notes from Craig Swanson's recent archive & backup class sponsored by the School of Visual Concepts, January 19 and 20, 2005.]

Archive Resources:

Below are a number of resources available from the National Institute of Standards and Technology (NIST). NIST has been working on a series of tests and standards in their "Digital Data Preservation Program."

http://www.itl.nist.gov/div895/carefordisc/

Care and Handling of CDs and DVDs — A Guide for Librarians and Archivists (PDF)

A 50-page publication from NIST going into considerable detail on how to maintain your archives for the long-term.

Do's & Don't for CD and DVD archive preservation. [Link to site]

Do:

1. Handle discs by the outer edge or the center hole.

2. Use a non solvent-based felt-tip permanent marker to mark the label side of the disc.

3. Keep dirt or other foreign matter from the disc.

4. Store discs upright (book style) in plastic cases specified for CDs and DVDs.

5. Return discs to storage cases immediately after use.

6. Leave discs in their packaging (or cases) to minimize the effects of environmental changes.

7. Open a recordable disc package only when you are ready to record data on that disc.

8. Store in a cool, dry, dark environment in which the air is clean.

9. Remove dirt, foreign material, fingerprints, smudges, and liquids by wiping with a clean cotton fabric in a straight line from the center of the disc toward the outer edge.

10. Use CD/DVD cleaning detergent, isopropyl alcohol or methanol to remove stubborn dirt or material.

11. Check the disc surface before recording.

Don't:

1. Touch the surface of the disc.

2. Bend the disc

3. Use adhesive labels.*

4. Store discs horizontally for a long time (years).

5. Open a recordable optical disc package if you are not ready to record.

6. Expose discs to extreme heat or high humidity.

7. Expose discs to extreme rapid temperature or humidity changes.

8. Expose recordable discs to prolonged sunlight or other sources of UV light.

9. Write or mark in the data area of the disc (area where the laser "reads").

10. Clean in a circular direction around the disc.

For CDs especially do not:

1. Scratch the label side of a CD.

2. Use a pen, pencil, or fine tip marker to write on the disc.

3. Write on the disc with markers that contain solvents.

4. Try to peel off or re-position a label.

*Note: At CreativeTechs we strongly recommend printed labeling of your archive CD's. Based on NIST's guidelines this would require using a printer that prints directly on the CD surface.

Stability Comparison of Recordable Optical Discs — A Study of Error Rates in Harsh Conditions (PDF)

Report on research testing how different brand CDs and DVDs hold da.

Archive Indexing Software:

File Name Indexing:

CD Finder 4.3.1

CD Winder 1.9.1 [Windows Version of CD Finder]

Visual Indexing:

Extensis Portfolio

Canto Cumulus

Backup Resources:

The Backup Book by Dorian Cougias

The best book on backup available. The biggest flaw is the intimidating length of 595 pages. Download the first chapter "When bad things happen to good computers."

Backup Hardware:

Example Tape Drives:

Drive

Tape Size

Tape Cost

Drive Cost

AIT1 Tape Drive

+/- 45GB

$50

$775

AIT2 Tape Drive

+/- 65GB

$55

$1,200

AIT3 Tape Drive

+/- 130GB

$55

$2,100

Example Tape Libraries:

Library

Tape Size

# of Tapes

Max Capacity

Library Cost

15-Tape AIT1 Library

45GB

15

675GB

$3,500

15-Tape AIT2 Library

65GB

15

975GB

$4,000

15-Tape AIT3 Library

130GB

15

1.9TB

$5,500

Example FireWire Hard Drives:

Drive

Cost

250GB HD

$210

500GB HD

$450

1TB HD

$999

1.6TB HD

$2,200

Copyright 2004, 2005 CreativeTechs, Inc.