Approved by the DDR Program Committee, December 5, 2016
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Purpose
In keeping with the [[mission of the Duke University Repository]], Duke University Libraries (DUL) and Duke University are committed to the long-term preservation and persistent access to the University’s digital assets curated in the Duke Digital Repository (DDR). Duke University Libraries is committed to the stewardship of these materials into the future. The following Digital Preservation Policy describes the DUL’s overarching approach to sustainable access for digital objects. Detailed strategies for preservation activities are documented in the [[Preservation Strategies]]. Acknowledging the rapid, ongoing changes in this technological environment, policies are subject to change.
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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 three backup copies. For more information, see the Backup and Disaster Recovery documentation.
Geographically disparate copies
Duke University Libraries maintains at least three distinct replicas of DDR data at all times. The Libraries contracts with DuraCloud, a library-oriented, preservation-focused storage provider, to support off-site data replicas. The primary copy of the data is locally-stored at Duke with the secondary copy in DuraCloud and tertiary copy in Amazon Glacier.
File formats and obsolescence management
File formats will be surveyed and evaluated to create list of preferred file formats
File formats will be monitored for obsolescence
Select file formats will be migrated to formats presenting less risk
Formats that are not preferred may still be included in DDR and receive bit-level preservation, but may not receive enhanced preservation
For more information, please see the Format Policy Metadata
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
For more information on security, see our Threat Models documentation.
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