if your filesystem was copy on write and implemented snapshot semantics internally (like WAFL for example, over 20 years old now), then the second snapshot woul

if your filesystem was copy on write and implemented snapshot semantics internally (like WAFL for example, over 20 years old now), then the second snapshot would not take 100MB, it would just cost the metadata. A commit is a snapshot of a tree with a reference to it's prior ancestors. It's important to know that because it becomes extremely relevant when trying to do things like merges properly.