Yes, refer this link to get the API details to export or update Solutions articles and folders.
You can also do this by navigating to Admin > Account > Account Details > and click on 'Export'. This will send a downloadable link to the registered agent email address, clicking on which would download a folder containing Solutions in XML format, along with other account information. Please note that only Agents with the 'Account Administrator' role would have access to Account Settings and only these agents would be able to trigger an account export.