A global, P2P, versioned data store! IPFS is a really interesting idea and works better than I expected.
miniblog.
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I'm coming to the conclusion that /etc should be in a versioned file system (e.g. NILFS), or related tool like etckeeper.
I look forward to the day that not storing data on versioned file system is an optimisation, not a default.
So, apparently lisp machines had versioned file systems. It's a royal shame they haven't become popular on Linux systems.