We're using next, next-on-pages. If I'm building locally, there's the .next and .vercel directories

We're using next, next-on-pages. If I'm building locally, there's the .next and .vercel directories that I believe help reduce rebuilds with caching/deltas? If we call a webhook to deploy again, will those directories be around to reduce rebuild time? (I'm still pretty new to Next in this way, so it's possible I'm confused.)
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