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Bit-level preservation will be provided to all digital objects in the repository through fixity checking and version control
Depositors may submit fixity information along with objects to validate against during ingest. Fixity checks are performed by the repository at regular intervals.
- Objects that fail a fixity check will be restored from one of two backup copies
Geographically disparate copies
Duke University Libraries maintains at least three distinct replicas of DDR data at all times. The Libraries contracts with campus the Office of Information Technology to support data replicas. The primary copy of the data is locally-stored at Duke with a secondary, nearline copy also at Duke, and a tertiary copy on tape. Plans for an off-site, geographically distributed fourth copy are under consideration.
File formats and obsolescence management
File formats will be surveyed and evaluated to create list of preferred file formats
Prior to ingest into the repository, select file formats may be migrated to formats presenting less risk
Formats that are not preferred may still be included in DDR and receive bit-level preservation
Support for descriptive, administrative, technical, and preservation metadata to ensure continued understanding of the materials stored in DDR
Information Security
Authorization to read, write, move and/or delete materials and metadata from DDR will be controlled
DDR will maintain and periodically audit logs of read, write, edit, and delete actions taken
Jira Legacy showSummary false server System JIRA serverId 5d75cb1e-8d3a-3fc0-9a34-07951d842959 key DDRCUR-450
References
- United States Computer Emergency Readiness: Team Data Backup Options
- National Digital Stewardship Alliance: Levels of Digital Preservation
- Significant properties of digital objects: definitions, applications, implications
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