Simple Web Text Data Migration

I need all of my plain-text content moved from its current web location to a new destination right away. There are no images or other file types involved—just straightforward text that must arrive intact, correctly formatted, and searchable on the target site. Please tell me exactly how you would tackle the move, any tools or scripts you prefer (for example, Python, PHP, cURL, or an API-driven approach), and how long each step will take. A concise but detailed project proposal is essential so I can see your plan before we start. Speed is critical; I’m ready to award as soon as I’m confident the migration can be finished ASAP with zero data loss and minimal downtime.