Digital Preservation and Sustainability

Digital information is fragile: formats become obsolete, media decay, and the software needed to read a file can vanish within a decade. Digital preservation is the active, ongoing work of keeping digital resources usable, and sustainability asks how projects can survive beyond their funding.

Definition

The active management of digital materials to keep them accessible and usable over the long term, together with the organizational and financial practices that sustain digital projects beyond their initial creation.

Scope

Covers the strategies and frameworks for keeping digital resources accessible over time: the threats of format obsolescence and bit rot, preservation strategies such as migration and emulation, reference models like OAIS, and the institutional and financial sustainability of digital scholarship. Includes the distinction between storage and active curation.

Core questions

• Why does digital information degrade or become unreadable, and how fast?
• How do migration and emulation strategies differ in preserving access?
• What does the OAIS model specify for trustworthy digital repositories?
• How can digital humanities projects remain sustainable after funding ends?

Key concepts

• Format obsolescence
• Bit rot
• Migration
• Emulation
• OAIS
• Sustainability

Key theories

The obsolescence problem

Rothenberg warned that the rapid obsolescence of formats and hardware threatens the longevity of digital documents, making active preservation, not mere storage, essential.

Migration versus emulation

Preservation can move content into current formats (migration) or recreate the original environment (emulation); each trades fidelity, cost, and risk differently.

OAIS reference model

The Open Archival Information System model provides a standard framework of functions and information packages for trustworthy long-term preservation repositories.

History

Rothenberg's 1995 article crystallized concern about digital longevity. The OAIS reference model, first issued in 2002 and revised in 2012, became the standard framework for preservation repositories. Kirschenbaum's work on digital materiality and growing attention to project sustainability shaped preservation thinking within the digital humanities.

Debates

Migration versus emulation

Whether to keep content readable by repeatedly converting it to current formats or by preserving the means to run original software remains a central, context-dependent preservation choice.

Key figures

• Jeff Rothenberg
• Matthew Kirschenbaum

Seminal works

• rothenberg1995
• ccsds2012
• kirschenbaum2008

Frequently asked questions

Isn't backing up files enough to preserve them?

No. Backups guard against data loss but not against format and software obsolescence: a perfectly preserved file is useless if nothing can open it. Preservation requires active curation — migrating formats, maintaining metadata, and following frameworks like OAIS — over the long term.