The PKP Preservation Network offers free preservation to any journal running Open Journal Systems (OJS) that has an ISSN. As of September 2018, 856 journals have deposited 22,549 issues into the network. The network is administered by the Public Knowledge Project and supported by partners who are running preservation nodes, along with an Advisory Panel. Future development will allow it to preserve supplemental and linked content
Journal deposit into the dark archive is fully automated through an OJS plugin. The content is harvested and processed by a staging server and then stored in a LOCKSS network. In case of a trigger event, a journal's content will be republished for public access.