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Great. The chunked model (inspired by Borgbackup/Tarsnap) seems preferable to Docker layering, and diff-based approaches.

As far as I can tell, the advantages compared to Borgbackup seem to be:

* casync offers control over which FS metadata is included

* casync, the server, exposes chunks over HTTP

* casync, the library, is written in C so is more easily used by systems software.

I'm betting we'll see machinectl integration. Excellent!

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Oops. Just realised my comment contains a mistake.

casync does not act as a server. Its on-disk representation and client behaviour is designed in such a way that the server need only serve static files. This makes deployment easy.

> I'm betting we'll see machinectl integration. Excellent!

systemd-nspawn integration is what I was thinking about too, so yeah! Nice work.

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