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Similar post by different author https://fmnxl.com/blog/setting-up-nix-binary-cache/

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    You can also serve the cache directly from the local Nix store on NixOS. This is useful if you are self-hosting the cache on the same machine that builds it. I do this for my home-server, which is relatively powerful compared to my ultrabook, and so I do most builds on it, which automatically gives me free cache, without having to manually push.

    The linked tweet contains links to my Nix configuration.