How to I create a backup of my content ONLY?
Node export is the best option to take backup for contents. One click export, import for the particular content types.


  This module allows users to export nodes and then import it into
  another Drupal installation, or on the same site.
  
  Using this module you can save yourself a lot of time setting up new
  websites that have similar nodes to websites you've already made,
  migrating nodes to new Drupal versions, or between
  development/staging/production sites.
  
  You will need the same content types for the imports to work (unless
  using Feeds to import), and ideally relevant compatibility with
  fields, and modules.