self-hosting (n.)
/ˌsɛlf ˈhoʊstɪŋ/
The practice of running and maintaining one’s own websites and online services—such as e-mail, messaging, file sync, or time services—on privately controlled servers rather than relying on third-party providers.
A mode of digital autonomy in which an individual or organization takes direct responsibility for their data, privacy, and infrastructure, often to increase control, reduce dependency on external platforms, and build technical skill.
— “Since he started self-hosting his mail and cloud storage, he feels far more in control of his data.”