Hi Christin-
Thanks for the question, I’m sorry to hear that you’re not able to create a backup.
The error Missing host from DSN String would seem to imply that Total Upkeep could not find your website’s DB_HOST setting as defined in your wp-config.php file. Most of the time, including on InMotion Hosting servers, this setting should be ‘localhost’. If you check you wp-config.php file using your Host’s File Manager or FTP, you should see a line similar to the following:
define( 'DB_HOST', 'localhost' );
Double-check that line in your wp-config.php and let us know if you have any questions setting it up as localhost.