Windows doesn't recognise backup set

[Windows 10]

I am trying to restore some specific files from a backup saved on a network location. File Manager sees the files OK (see image below). When I go into Restore Files/Select another backup to restore files from and select that network location, I get an error.There are many questions like this in various forums (some quite dated, so of questionable relevance), but after reading scores of them I am no wiser. Is there a simple up-to-date solution?

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