The following is a guest post by Abbie Grotke, Web Archiving Team Lead at the Library of Congress.
Eleven years ago, the Library of Congress established a pilot web archiving project to study methods to evaluate, select, collect, catalog, provide access to and preserve at-risk born digital content for future generations. We could write a book (or at least a few blog posts!) about lessons learned since then, yet we continue to face a variety of challenges.
Future blog posts will cover some of our technological and legal challenges, but today and in a following post Ill talk about our social issues: with the Web so big, what do we preserve and who preserves it?
There are a few approaches to Web archiving: bulk or domain harvesting (for example, the National Library of Iceland archives all of .is), and selective, thematic or event-based harvesting.
Identifying what the U.S. Web might be is nearly impossible. Archiving .us certainly doesnt cut it. Theres no one master list to which we can refer to incorporate all of the websites generated by and hosted in the United States (although the recent news about USA.gov publishing a list of all top-level government domains gives us some hope). So it comes as no surprise that the Library has taken a selective approach to Web archiving.
Weve collected over 240 terabytes of content, in almost 40 event and thematic collections. Our strengths are in government, public policy and law: we archive U.S. national elections, house and senate and committee sites, changes in the Supreme Court and legal blawgs.
We also build web archives with our special collection divisions the Manuscript, Prints and Photographs and Music divisions are archiving sites related to their physical holdings. In recent years Library staff in overseas offices in Egypt, Brazil, Indonesia, India and Pakistan captured born digital content documenting elections and other events.
Our collections are in various stages of production so not all are available to researchers yet. Once a collection is completed (or in the case of ongoing archives, after about a year of archiving) we transfer the content to the Library of Congress from the Internet Archive. We currently contract with them to do our large-scale web crawling.
Then staff in the Librarys Acquisitions and Bibliographic Access division catalog the sites and we work together to prepare them for public access. This process can take anywhere from one year to much longer. To give you a clue, we just recently launched the Election 2008 Web Archive.
Next time Ill talk about how we work with other libraries and archives to build collaborative web archives.
In the meantime, check out our publicly available collections by visiting the Library of Congress Web Archives.