Last Updated: January 26, 2022

Durability is among Fulcrum's core values, and the foundation of our durability lies in our commitment to the preservation of the content which we publish. Our goal is to make publishing content on Fulcrum synonymous with adding it to the durable record of scholarship, as there is no preservation without access, and there is no access without preservation. This Preservation Statement expresses that commitment by answering the questions: "What can I expect a future scholar to encounter if they follow my citation to content I used on Fulcrum? How faithful should I expect a future representation of this content to be to what I see on Fulcrum today?"


The Fulcrum Preservation Statement conforms to the University of Michigan Library'sDigital Repository Services Digital Preservation Policy.


Digital preservation is often discussed in terms of technologies and file formats, but the Fulcrum team considers preservation primarily a commitment of time, attention, and active management of data and metadata. Through these commitments we will develop and maintain a variety of technological strategies and partnerships to achieve our commitments to durable publishing. As the future is unknown, successfully fulfilling our commitments requires a diversity of approaches to mitigate risk.

Strategic Diversity

The digital preservation community has identified a number of basic strategies for digital preservation:

  • 位保存:按原样保存数据,保证不发生数据丢失或损坏。这个策略是所有其他数字保存策略的先决条件;然而,由于文件格式过时,单独使用它无法保证数据的未来可用性或生存能力。
  • 迁移:通过根据需要将内容重新格式化为可用的后续格式来克服文件格式陈旧的问题。选择符合开放标准的文件格式可以在不损失内容特性的情况下极大地提高这种能力;但是,迁移过程可能会导致内容表示方式的更改。
  • 模拟:模仿提供内容的原始(过时或不可用)硬件或软件,以“原样”呈现原始数字对象,尽可能保留原始呈现和用户体验。


Institutional and Geographic Diversity

Fulcrum fulfills its preservation commitments through a strategy based on balancing local and distributed resources. By engaging in a number of partnerships, Fulcrum guards against the risk of technological failure, changes in institutional priorities, or inability to meet commitments at any one institution, thereby eliminating single points of failure and ensuring the long-term access to content published on Fulcrum.

The University of Michigan Library


U-M图书馆的制度立场强烈倾向于迁移策略,我们通过在吸收点限制文件格式的策略来实现这一点。Ourfile format guidelinesare based on the recommendations of the Library of Congress and reflect the accepted best practices of the digital preservation community. Fulcrum's file format recommendations may place further restrictions based on compatibility with software tools, functionality on our platform, publishing industry standards, and accessibility. The open, published standards represented in these guidelines put us in the best position today to successfully migrate content to tomorrow's successor formats.

On those occasions where no open standard is available, or thede factostandard within a given discipline is a proprietary file format, Fulcrum may host the file with a commitment only to bit preservation. In those cases, when the file becomes obsolete, we may continue to host it as-is as an artifact of possible historical interest.

Fulcrum follows the principle of "Preservation is Access, Access is Preservation". Our Hyrax platform is backed by a Fedora 4 repository where preservation masters are managed in the U-M datacenter; masters are stored and backed up using enterprise-quality equipment and services provided by U-M Information Technology Services. This same repository is used for managing both the preservation masters and the access derivatives which are served to the browser in a user session, their relationship expressed explicitly via RDF metadata in our data model. In this way the same resources that maintain the access repository also benefit the preservation repository, and any problems that arise are more visible to the system administrators. Furthermore, by keeping content in our preservation repository, we are also committing to maintaining its access by readers.

Preservation Partners

Fulcrum has diversified its preservation portfolio through relationships with a number of other organizations, each with their own technological implementation and management structures. We have contracted with CLOCKSS, which is CRL-certified TRAC-compliant and introduces geographically distributed redundancy to our preservation solutions. Deposits into CLOCKSS must be configured on a per-collection basis; at the present time, our workflows cover the University of Michigan Press Ebook Collection. If you're interested in having your collection included in such an arrangement, please speak with the Fulcrum team.

U-M Library is a member of APTrust and routinely deposits all Fulcrum content into their cloud-based, consortially-governed service, providing further organizational and geographic redundancy for everything published on Fulcrum.

Michigan Publishing is a partner in the Mellon-fundedEnhancing Services to Preserve New Forms of Scholarshipgrant administered by NYU, exploring methods with CLOCKSS and Portico to preserve the richness of digital media enhancements to ebooks on Fulcrum among other platforms.

The culmination of local and partnered preservation commitments, which place our content into storage networks distributed across multiple continents, actively managed by a range of mission-driven, non-profit consortia and partnerships (some of which havetheir own succession plans), mitigates the risk of catastrophic failure on any number of fronts, and helps ensure that the content published on Fulcrum today will remain in the scholarly record for many years to come.

Scope of our preservation commitment

Preservation always entails making choices about what to preserve. While Fulcrum strives to capture the most comprehensive record possible of a published work, finite resources of time, attention, and technology require the scrupulous application of those resources in order to achieve a preservation strategy that is most likely to succeed technologically while being comprehensible and useful to future generations.

What are we preserving?

Fulcrum's preservation commitment is focused on maintaining a "Version of Record" of the published work. Such a concept is intentionally malleable and subject to change as technologies and publishing conventions evolve, but is intended to capture the material that is essential to conveying the scholarly argument embodied in a work. At present, we are focused on preserving the text in EPUB3 format (or PDF/A, if EPUB is not available); any components embedded in the text (that would typically be included in an EPUB3 file), such as figures, tables, or time-based media; metadata, for the work as a whole, for the individual components, and relationships among the parts; and any supplemental materials that may be hosted on the platform. University of Michigan Library's strategy focuses on preserving all content in the form of its constituent files, migrating to new formats when both necessary and possible. All content is accompanied by metadata in schema that conform to current best practices in the Library community. Deposits into APTrust will include the full range of content that U-M Library commits to preserving. At present, CLOCKSS is supporting ingest and preservation support for EPUB3 and PDF/A, and we will be working to add support for media formats in the future.

U-M Library will conduct a review after a 10 year period to determine if objects hosted on Fulcrum should be retained and be subject to further, periodic, reviews thereafter. The goal of these reviews is to identify and possibly remove objects that have reached the end of their use and reuse life cycle, or have become unusable due to format obsolescence. U-M Library may conduct the review before 10 years if it identifies that a format is becoming obsolete. The retention review will be conducted by U-M Library and, whenever possible, by the partner who is responsible for its deposit.

如果由于保留审查或法律或合同原因,材料被从Fulcrum移除,我们将使用元数据和移除通知来维护墓碑,持久标识符(DOIs, Handle System URLs)将继续解析。Where possible and applicable, the tombstone record will point to and/or resolve to the new location for the content.

What are we not preserving?

Fulcrum's preservation commitments do not at present attempt to capture the context or user experience in which the materials described above are made available to the public. The following are considered out of scope:

  • 关于宣传册,包括市场推广和宣传材料。
  • User experience: emulation, "look and feel", design changes over time, or navigation methods.
  • Websites associated with materials published on Fulcrum but not hosted on the platform.
  • The Fulcrum softwareis hosted open source on GitHub, in accordance with current U-M Library policy, but we do not currently have a strategy for independently preserving the codebase beyond our current production and development environments.