We offer an (optional) exporting function that by default utilizes a server hosted by us to rasterize chart graphics - this is the only server-side component part of the solution. It's only enabled when explicitly including support for it when implementing the libraries in an application, and can be self-hosted if desired (the source for it is MIT licensed and freely available on GitHub). We also have an offline alternative, that requires no server-side component. In terms of data processing, the server is completely stateless, and does not store the visualization configuration once the export request has been processed. For more details, please see https://www.highcharts.com/docs/export-module/privacy-disclaimer-export.