Self-hosting lets you choose where the application and database run. That choice alone does not establish GDPR compliance or mean that all data stays in one country.
Payment processing, email, media storage, real-time services, backups and installation or maintenance access may involve other providers and locations. Review the configured services and access arrangements before launch. An EU application server alone does not establish EU-only processing.
Document the services and access needed for your installation, together with your privacy notices, retention and security requirements. Confirm the relevant agreements and data-request procedures for your organization. No compliance certification or blanket residency guarantee is offered here.
One license, installed free on your server, with 6 months of support and updates included.