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The Office 365 backend uses git to store snapshots of documents. [1]

https://github.com/microsoft/FluidFramework/tree/main/server...

That is not exactly what it says. It says it uses a content-adressable system and you can talk to it as if it was git.

And the content-adressable filesystem that it uses is git [1]. It uses git with a javascript implementation of it [2] or node bindings to a c one [3].

1. https://github.com/microsoft/FluidFramework/tree/main/server...

2. https://github.com/isomorphic-git/isomorphic-git

3. https://github.com/nodegit/nodegit

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