NDSA Levels of Digital Preservation simplified, see source for more info:
|Storage and Geographic Location||2 non-collocated copies off heterogeneous media (e.g., hard drives, optical disks, etc.)||A copy at another geographic location + storage system documentation||Disaster threat levels addressed||A plan to keep files and metadata accessible|
|File Fixity and Data Integrity||File fixity on ingest||Virus check on ingest||Regular checks + logs; detect corrupt data||Replace/repair corrupted data; distributed write access to copies|
|Information Security||Identify and restrict access rights to individual files||Document access restrictions||Logs of all actions on files||Audit of logs|
|Metadata||Inventory of content and its storage location + back-up||Store administrative and transformative metadata||Store technical and descriptive metadata||Store preservation metadata|
|File Formats||Encourage use of a limited set of open file formats and codecs||Inventory of file formats in use||Monitor file format obsolescence||Perform format migrations, emulation and similar activities as needed|
Suggestions for research agenda in digital preservation, from Digital preservation, archival science and methodological foundations for digital libraries (S. Ross, 2012, New Review of Information Networking, 17:1, 43-68, doi).:
- Restoration - restoring damaged digital objects, including content, context and experience and verifying their completeness.
- Conservation - saving digital objects before they are damaged and making sure they cannot be damaged or destroyed in the future.
- Collection management - making decisions about what goes in and out, etc.
- Risk management - determining and quantifying uncertainties and minimizing various threats.
- Interpretability and functionality - making sure digital objects remain meaningful, authentic, and usable.
- Cohesion and interoperability - maintaining connections and transitions across systems, time, and repositories.
- Automation - developing tools for handling big quantities of information.
- Preserving the context - retaining information about how the object was created and used.
- Storage - developing infrastructure for storing digital objects.
Preservation plan, from Systematic planning for digital preservation: evaluating potential strategies and building preservation plans (C. Becker, H. Kulovits, M. Guttenbrunner, S. Strodl, A. Rauber, and H. Hofman, 2009, International Journal of Digital Libraries, 10(4), 133-157, the Plato tool):
- Identification - an ID for easy location and retrieval.
- Status and triggers - status can be draft, waiting approval, deployed, ect. Triggers are events that warrant a planning activity, e.g., a new collection, changes in collection activities, technology, objectives.
- Description of the institutional setting - mission, policies, designated communities, agreements.
- Description of the collection - objects IDs, types of objects, original technical environment.
- Requirements for preservation - technology, standards, usage, legal constraints, etc.
- Evidence of decision for a preservation strategy - keep track of how decisions have been made and why alternatives were discarded.
- Roles and responsibilities
- Action plan - what to do and when.