European data residency for calendar APIs: how to evaluate vendors
Blog post from Nylas
European calendar API evaluations should begin by identifying whether data residency is a binding EU/EEA storage obligation, a requirement for lawful international transfers, or an internal preference, since these categories permit different vendors and cannot be resolved by generic GDPR-compliance claims. The guide compares publicly documented European hosting options for vendors including Nylas, Cronofy, Cal.com, Google Calendar API, and Outlook Calendar API, while emphasizing that customers must verify current contractual commitments, data scope, configurations, and transfer safeguards. It notes that UK hosting may be lawful under EU adequacy rules but does not meet contracts requiring literal EU/EEA storage, and that direct integrations with Google or Microsoft shift rather than remove residency responsibilities because applications still process retrieved data. Beyond storage, buyers should assess remote support and engineering access, escalation coverage, subprocessors, permissions, certifications, provider compatibility, and future integration needs such as email, contacts, and scheduling. Residency should serve as an early eligibility filter where contractually mandatory, followed by a broader review of security, governance, regional architecture, and migration implications, including Cal.eu’s planned shutdown on 1 November 2026.
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