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Digital Preservation

The Library of Congress > Digital Preservation > National Digital Stewardship Alliance


Recently Published Report: "Geospatial Data Stewardship: Key Online Resources"

A report (PDF) of the Geospatial Content Team that lists online resources that highlight key concepts and practices supporting the preservation and stewardship of digital geospatial data and information. The resources offer a starting point to methods, tools and approaches across the information lifecycle to assist in understanding current best practices in the stewardship of geospatial data. These resources will be regularly updated online at the "Geospatial Data Stewardship: Key Online Resources" web page.

Report: "The Benefits and Risks of the PDF/A-3 File Format for Archival Institutions"

A report (pdf) created by the Standards and Practices Working Group that takes a measured look at the costs and benefits of the widespread use of the PDF/A-3 format, especially as it effects content arriving in collecting institutions. It provides background on the technical development of the specification, identifies specific scenarios under which the format might be used and suggests policy prescriptions for collecting institutions to consider. More information in a 2/20/14 blog post on the Signal.

Report: "Staffing for Effective Digital Preservation"

A report (pdf) created by the Standards and Practices Working Group, sharing what the group learned by surveying 85 institutions with a mandate to preserve digital content about how they staffed and organized their preservation functions. More information in a 12/16/13 blog post on the Signal.

Report: "Issues in the Appraisal and Selection of Geospatial Data"

A report (PDF, 554 KB) of the Geospatial Content Team of the Content Working Group considering both appraisal and selection activities as they effect decisions defining geospatial content of enduring value to the nation.

Our Mission

The mission of the National Digital Stewardship Alliance is to establish, maintain, and advance the capacity to preserve our nation's digital resources for the benefit of present and future generations.

Our Work

Members collaborate to preserve access to our national digital heritage. The NDSA accomplishes its goals through working groups with strategic direction from the Coordinating Committee and support from the Secretariat.

The NDSA has established five Working Groups focusing on the following areas of digital stewardship: Content; Standards and Practices; Infrastructure; Innovation; and Outreach.


selection and aquisition of digital collections


digital formats and best practices


development and maintenance of tools


cutting edge research and development


relationships and messaging

Our Members

NDSA organizations have proven themselves committed to long term preservation of digital information. Our members include universities, consortia, professional societies, commercial businesses, professional associations, and government agencies at the federal, state, and local level. For a list of members, click "NDSA" on this page.

Learn more about membership to the NDSA.

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