Data residency
DAY-tuh REZ-ih-den-see
The requirement that data be stored and processed within specific geographic boundaries, often mandated by local laws or regulations.
Data residency means keeping data within specific geographic boundaries. Some countries and industries require that personal or sensitive data be stored and processed on servers physically located in a specific region. Germany wants German data on German servers. India's data localization rules require certain financial data to stay in India.
For SaaS companies, data residency is an infrastructure and sales challenge. If a customer in the EU requires data residency in the EU, you need servers in the EU. If a customer in Australia requires Australian data residency, you need Australian infrastructure. This means multi-region deployments, regional data isolation, and careful routing. GDPR and standard contractual clauses add further requirements for cross-border transfers.
The complexity multiplies with sub-processors. Your data might stay in the EU, but does your analytics provider send it to the US? Does your logging service store it somewhere else? Every link in the chain must comply with the residency requirement. Your DPA with each vendor must document where data is processed.
Examples
A European bank requires EU data residency.
The SaaS vendor deploys a dedicated instance in AWS eu-west-1 (Ireland). All customer data, backups, logs, and analytics for this customer are configured to stay within EU regions.
A SaaS company builds multi-region support.
The engineering team adds a region selector during onboarding. Customers choose US, EU, or Asia-Pacific. Each region has its own database, file storage, and processing pipeline. Data does not cross regional boundaries.
An audit reveals a data residency violation.
A customer's data is supposed to stay in the EU. An audit reveals that error logs containing user data are sent to a US-based logging service. The engineering team switches to a logging provider with EU data centers.
Frequently asked questions
What is the difference between data residency and data sovereignty?
Data residency is about where data is physically stored. Data sovereignty is about which country's laws govern that data. Data can reside in Germany (residency) but still be subject to US law if the company is US-based (sovereignty). GDPR addresses both.
Do all countries require data residency?
No. Data residency requirements vary by country and industry. Russia, China, and India have broad requirements. The EU emphasizes adequate protection rather than strict residency. The US has sector-specific rules but no general data residency law.
Related terms
The European Union regulation that governs how companies collect, store, and process personal data of EU residents.
A contract between a data controller and data processor that defines how personal data will be handled, required under GDPR.
EU-approved contract templates that allow the lawful transfer of personal data from the EU to countries without equivalent data protection laws.
A legal document that explains what personal data a company collects, how it uses that data, and how it protects it.
Want the complete playbook?
Picks and Shovels is the definitive guide to developer marketing. Amazon #1 bestseller with practical strategies from 30 years of marketing to developers.