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by vtbassmatt 3318 days ago
The Windows team developed a tool called "GitTrain" that knew how to:

- migrate the tip of a branch to Git (yes, the 300GB number is the tips of all the interesting branches, not the history)

- keep a Git branch and a SD branch in sync for a while

- be re-run over each of the 400+ branches they care about

But they went through some of the same trial-and-error process that you're describing.