Today I'd like to look at one of the most obvious, but least thought of, reasons for why sites stop working. Plain and simple--it's billing. Drupal may be free* (with an asterisk), but even with an open source CMS, you'll likely be signing up for any number of products and services in order to run your site. Your server, your domain, your SSL Certificate--these are all fundamental in your site's operations. What happens if you don't pay for them?