Where is data stored (if at all)?

As a SaaS company, CiraSync integrates tightly with Microsoft Azure, utilizing the Azure Consent Framework (https://docs.microsoft.com/en-us/azure/active-directory/develop/consent-framework). If you are a subscriber, your data is being kept within the Microsoft Cloud. We currently have servers collocated within the Eastern US and European Microsoft Azure cloud servers. To meet GDPR requirements, our European clients are able to configure their data residency setting from the CiraSync Enterprise Edition dashboard. For more details on this, visit our blog: https://www.cirasync.com/office-365-data-residency-setting-for-cirasync/