Not sure I understand, you're talking about mirroring git repo data between multiple different nodes? That seems unrelated to what's proposed in the OP--maybe you're seeing something I'm not?

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tcfhgj an hour ago | parent [-]

if I fork a repository to my forge, I expect my forge to have an independent copy of the repo

	▲	nightpool an hour ago \| parent [-]
		How does that fix "when one node goes offline you may not have any upstream to pull from"? You'd still have your own local copy—just like git—but you wouldn't be able to access any sense of "upstream"