Create an independent editable draft from a broadcast that has been complete for at least 24 hours, including the exact 24-hour boundary. Copies published content, sender and reply-to settings, topics, and A/B variants and settings; clears the old schedule and results. The audience is contacts recorded as sent the source without a recorded open, subject to current subscription and suppression rules. It is evaluated when the separate send flow prepares recipients; a later open does not remove a queued recipient. This request never sends or schedules the draft. Review or edit the returned broadcast, then create its send action separately. Takes no body or content overrides. Each successful call creates another draft, so retrying is not idempotent. Requires email write access, source read access, permission to create broadcasts, and a workspace grant covering the source workspace.