When Cliff Lynch found out that I was writing a report for the Mellon Foundation, the Sloan Foundation and IMLS entitled
Emulation & Virtualization as Preservation Strategies he asked me to give a talk about it at the Fall CNI meeting, and to debug the talk beforehand by giving it at UC Berkeley iSchool's "Information Access Seminars". The abstract was:
20 years ago, Jeff Rothenberg's seminal Ensuring the Longevity of Digital Documents compared migration and emulation as strategies for digital preservation, strongly favoring emulation. Emulation was already a long-established technology; as Rothenberg wrote Apple was using it as the basis for their transition from the Motorola 68K to the PowerPC. Despite this, the strategy of almost all digital preservation systems since has been migration. Why was this?
Preservation systems using emulation have recently been deployed for public use by the Internet Archive and the Rhizome Project, and for restricted use by the Olive Archive at Carnegie-Mellon and others. What are the advantages and limitations of current emulation technology, and what are the barriers to more general adoption?
Below the fold, the text of the talk with links to the sources. The demos in the talk were crippled by the saturated hotel network; please click on the linked images below for Smarty, oldweb.today and VisiCalc to experience them for yourself. The Olive demo of TurboTax is not publicly available, but it is greatly to Olive's credit that it worked well even on a heavily-loaded network.