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Migration on Request, a Practical Technique for Preservation
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Migration on Request, a Practical Technique for Preservation
Phil Mellor6, Paul Wheatley6  and Derek Sergeant6
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CAMiLEON Project, Edward Boyle Library, The University of Leeds, LS2 9JT Leeds, UK |
Abstract
Maintaining a digital object in a usable state over time is a crucial aspect of digital preservation. Existing methods of
preserving have many drawbacks. This paper describes advanced techniques of data migration which can be used to support preservation
more accurately and cost effectively.
To ensure that preserved works can be rendered on current computer systems over time, “traditional migration” has been used
to convert data into current formats. As the new format becomes obsolete another conversion is performed, etcetera. Traditional
migration has many inherent problems as errors during transformation propagate throughout future transformations.
CAMiLEON’s software longevity principles can be applied to a migration strategy, offering improvements over traditional migration.
This new approach is named “Migration on Request.” Migration on Request shifts the burden of preservation onto a single tool,
which is maintained over time. Always returning to the original format enables potential errors to be significantly reduced.
Research for this paper was supported in part by the National Science Foundation, Award #9905935, Digital Library Initiative—
International, Emulation Options for Digital Preservation and by the Joint Information Systems Committee in the UK.
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