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deleted-
If it comes back, you could take an explicit backup: spread a thin layer on baking paper, dry on a radiator, flake off and break into a sandwich bag, seal & freeze. Reconstitute w/ water & whole rye flour or whatever you usually feed with. My off-site backups are in Kent and New Zealand—the latter had a test restore which went well.
aglet
The sourdough does look more like bike frame material than food at the moment.
May try and resurrect it, what’s the worst that could happen, other than food poisoning...