Open is not forever: a study of vanished open access journals, https://arxiv.org/abs/2008.11933
This study shows the need for systematic archiving and redundant copying of online open journals, but I suspect that the problem for small hand-run print-based journals without much library pickup might be much worse. Via https://news.ycombinator.com/item?id=24422593 and https://www.sciencemag.org/news/2020/09/dozens-scientific-journals-have-vanished-internet-and-no-one-preserved-them
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