Step 1: Download All-in-one WP Migration and install it. Navigate to Site Migration > Export.
Step 2: Click to Advanced options to expand them. Select checkboxes to choose data that don’t needed to be backed-up (excluding themes and plugins may be a good idea sometimes).
Step 3: Click on Eхport button to start exporting.
Navigate to Site Migration > Export. Then drag&drop backup file to upload it.