Easiest way in 2019 is the same way you'd do it in 2009, or even 1999. Setup a cron job that calls a simple PHP or Ruby script that calls CURL on a set of URLs

Easiest way in 2019 is the same way you'd do it in 2009, or even 1999. Setup a cron job that calls a simple PHP or Ruby script that calls CURL on a set of URLs and saves the HTML/extracted data into a MySQL database. All in a LAMP server. It's not sexy, but you asked for the easiest way. No need for all this serverless, or Cloudflare worker nonsense :)