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JJ works when an internal file is overwritten to another version, while it does an operation? I thought that's what we are discussing here.

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No, it avoids doing that (see the link someone shared above). Git actually also rarely overwrites files. The only case I'm aware of are refs, so I think it could happen that a if you modify a branch on two machines and then sync via Dropbox/rsync, one of those changes could get lost.

Ah, you mean to share the repo you are issuing git commands to directly. Yeah I would expect this to cause problems. Surprising to hear that JJ supports this.

This wasn't what I was talking about, I meant that you should create a bare repo and push to it, not that you work directly in a directory in Dropbox.

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