Digital Preservation: DP Overview
Saving vs Preserving
"Saving" a file is keeping it locally for an undetermined time as it was last saved.
"Preserving" a file is converting a file into an ideal preservation format, verifying its integrity, and storing it in multiple locations with low-access and high-security measures in place to ensure continued access.
Advantages of Digital Preservation
- Access to digitized and born-digital objects is technology-dependent
- Technologies can fail or become obsolete
- Less accessibility helps increase the odds of maintaining integrity
- Preservation is the solution to increasing the ability to access material in the future
OAIS Reference Model
See Brian Lavoie's DPC Technology Watch Report on the OAIS reference model for detailed information.
Digital Preservation Handbook
Digital Preservation Coalition
NDSA Levels of Preservation
Format Obsolescence: Assessing the Threat and the Defenses
by David S. Rosenthal
Northeast Document Conservation Center
List of digital preservation initiatives
What is Digital Preservation?
"Digital preservation is the series of managed activities necessary to ensure continued access to digital materials for as long as necessary. Digital preservation is defined very broadly [...] and refers to all of the actions required to maintain access to digital materials beyond the limits of media failure or technological and organizational change."
--Digital Preservation Handbook, 2nd Edition, http://handbook.dpconline.org/, Digital Preservation Coalition © 2015.
Importance of Digital Preservation
Digital Preservation Basics
Over time, preservation maintains:
- Authenticity: establishing a record's identity and integrity to ensure that it's "free from tampering or corruption."¹
- Identity: "the distinguishing character of the record"¹
- Integrity: a record's "wholeness and soundness" that maintains that the record is "complete and uncorrupted in all its essential respects"¹
Maintenance occurs through preventative measures, including:
- Assigning unique identifiers
- Normalizing content
- Regular fixity checks and virus checks
- Regular hardware inspections, fixes, and migrations
Ideal format properties:
- Non-proprietary file formats: formats that are free and open-source
- Large/stable user community: provides documentation and support
- Lossless compression: "A mechanism for reducing file sizes that retains all original data"²
¹InterPARES Authenticity Task Force Report. (2001).
²Digital Preservation Handbook, 2nd Edition, Digital Preservation Coalition © 2015.
Digital Preservation Coordinator
Director of Digital Libraries & Preservation
560 Drillfield Drive
Blacksburg, VA 24061
Example Preservation Policies
Below are a handful of preservation policies held by various libraries.