What functionality is missing? What is unsatisfying with the current situation?

  The goal is to make doing a backup quick and easy, rather than one article at a time.  

How does this feature request address the current situation?

  A one-click backup would encourage whole-world backups, where single article backup currently discourages that.  

What are other uses for this feature request?

  It would allow for the easy sharing of world data into other software or systems, for those who use World Anvil as a convenient system within which to do initial creation.   If easy export / import of whole worlds were availalble, it would facilitate world/database carbon copying, for any number of reasons including having one public and one private database, and the sharing of worlds between collaborator WA accounts.