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Produced as part of the COPIM project, this resource from 2023 has a focus on digital preservation of monographs. However, especially the introductions in chapter 1 and chapter 2 as well as the glossary-type explanations from p. 115 ff. proof to be of interest for the Diamond OA journals community too.
Click on 'Good, Better, Best': Practices in Archiving & Preserving Open Access Monographs to open the resource.