This is an updated checklist for the preservation of research data. The previous version of the checklist was published as part of a broader guide: The official University of Helsinki guide to the responsible preservation of research data (2.0), Zenodo. https://doi.org/10.5281/zenodo.10424017 This revised checklist differs from the earlier version in that it contains no university‑specific content, and may therefore be used freely by anyone who finds it helpful.