0101 Technological Infrastructure

Technology is required for the digital preservation program at many levels to:
>> create digital content
>> capture content and associated metadata as digital objects
>> transfer those objects to and within a digital repository
>> process or otherwise interact with digital objects in the repository
>> find and deliver stored objects
>> build and maintain the repository
>> define and implement the policies and protocols that pertain to the repository
>> integrate the repository and the digital materials into the broader organizational environment and the contexts in which it operates

Preservation planning is more than just recommending and adopting preservation strategies, which in itself is hard enough. The development of a technological infrastructure to sustain the digital preservation program requires a holistic design and implementation that will respond to evolving requirements. The OAIS standard defines these functions for preservation planning:

A technological platform must be assembled, scaled appropriately, documented, monitored for key developments, and upgraded or enhanced as necessary. Most organizations that already have digital content to manage are familiar with the twin pillars of systems support: file management and storage management. Doing these two functions is an important starting point. But beyond that, organizational decisions about technology—hardware, software, networks, staffing—can either enable or deter a digital preservation program. For example, the list below includes examples of technologies that may be required to make digital objects both renderable and understandable:

Every one of these components must interact and recognize the others in order to achieve long-term maintenance of a bitstream and continued accessibility of its contents. Given the rapid pace of technology change, each of these technologies is subject to obsolescence. Managing the availability and interaction of these technologies to support digital preservation is a constant challenge.

Institutional Scenarios
There are four possible scenarios for developing the technical infrastructure. Each has its strengths but the right solution will depend upon your institutional capabilities and priorities. The four options are:

Build

Extend

Join

Collaborate

Which is right for you? Consider the following characteristics:

Characteristics	Build	Extend	Join	Collaborate
Do you have existing digital content?	No	Yes	Yes	Some
Do you have access to or control over IT infrastructure?	Yes	Yes	Minimal	Maybe
Do you have a repository to leverage?	No	Yes	No	Maybe
Do you have startup resources?	Yes	Baseline	Limited	Limited
Do you have sustaining resources?	Yes	Limited	Limited	Limited

Digital Preservation Strategies
Many digital preservation strategies have been proposed, but no one strategy is appropriate for all data types, situations, or institutions. See Section 2, Terminology: Strategies for a brief tour of the range of current options. Some clearly address only a subset of the technical concerns, while others would be widely applicable. Some are in use today; some remain largely untested, especially in cultural institutions. Others represent theoretical possibilities that research groups are currently exploring.

Technology Forecasting
How does one know when changes in hardware and software will put a digital collection at risk? The answer: by actively monitoring technology developments and systematically considering potential preservation implications. Currently there is no central place where all of the necessary information has been brought together. Such a registry—if it existed—would have information about all the versions of every software package and piece of hardware in use, as well as literature and other indicators from domains of all kinds that refer to, contemplate, or otherwise discuss recent, current, and future developments. It would contain compatibility information—the interrelationships among file formats, software, and hardware versions. In an ideal world, this information would be an automated system with a risk monitoring module that would send alerts when a collection was put at risk by a coming change in technology. In the meantime, individual and collaborative efforts to stay informed are essential, including reading technology news, talking with vendors, and communicating with colleagues. Subscribe to padiform-l, the National Library of Australia’s list for digital preservation. Another source is the IFLA DIGLIB list, an active list about digital library information, with some traffic about digital preservation and technology. Read RLG DigiNews (back issues) and D-Lib Magazine, among others.