The British Library, Koninklijke Bibliotheek, Deutsche Nationalbibliothek, and Nasjonalbiblioteket have released Long-Term Preservation Services: A Description of LTP Services in a Digital Library Environment.
Here's an excerpt:
The main focus of this document is long-term preservation, but considered as an integral part of the overall digital library capability within a library and the corresponding workflows. We therefore seek information about long-term preservation within this broader context. Principles and implementation may vary greatly, and we are open to alternative approaches.
The document starts with an overview of all the types of services involved in LTP, and shows how different institutions might draw the boundaries between the LTP and a wider digital library capability. We then take the three core functions of an LTP system (to ingest, retain, and provide access to digital content) and show how the services work together to fulfill each function. Finally, we give a detailed description of each type of service.