As an Adimistrator, log in, go the Administration page and look down the left side. Under Server Administration, toward the bottom of the list, is Backup. What is backed up varies by version. On mine (v8.1.1) the "Basic" setting says that the backup scope is (emphasis mine):
- database
- server settings, projects and builds configurations, plugins
- supplementary data (settings history, triggers states, plugins data, etc.)