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Yes. Run both pipelines in parallel and point a share of traffic at the new one. Most teams cut over inside a week, and rolling back is a config change rather than a redeploy.
Exports stay available for 30 days after the last invoice, in the same JSON shape the API returns. After that the workspace is deleted and the deletion is logged.
Preview builds run on a separate allowance and never touch production minutes. You will see them itemised, but they only bill once the allowance runs out.
On the Business plan, yes — the runner ships as a container you place inside your own VPC, while scheduling stays with us. Air-gapped installs are handled case by case.