Sigi Jottkandt has published a literature review on preserving open access journals. From the abstract:
This literature review addresses certain questions concerning the preservation of free, born-digital scholarly materials. It covers recent thinking on the current state of preservation efforts of born-digital materials; the range of actors involved in significant preservation initiatives of these artefacts; the perceived barriers preventing open access materials from benefiting from existing preservation efforts; initiatives that may enable local, small-scale preservation efforts to be undertaken; the challenges and opportunities posed to preservation by new models of scholarship such as open access datasets, reference sharing and annotation, collaborative authoring and community peer review.
