By default POLYAS's online voting is hosted on the servers of the Open Telekom Cloud (OTC).
The OTC platform is provided exclusively in the German data centers of the Telekom AG. OTC (and T-Systems as the provider) have a large number of certificates that prove that the processing of data and services is in keeping with data protection regulations. For further information see https://open-telekom-cloud.com/en.
Only for the POLYAS test voting in the live voting, the servers of the Azure Cloud / EU West are used to start the test voting. For more information, see: https://azure.microsoft.com/en-us/.