This Deep Dive explores Memos, an open-source, self-hosted note-taking platform focused on digital privacy and data ownership. Unlike traditional apps like Evernote or Google Keep, Memos allows users to control their data by hosting it on their own devices or servers. This approach ensures complete data ownership, with no external dependencies or third-party access. Memos is built with Go and React.js, making it lightweight, fast, and compatible with various platforms. It supports markdown, image embedding, and instant saving, providing a rich user experience. While self-hosting requires users to manage backups and maintain their data, Memos offers extensive community support and easy setup via Docker. With over 300 contributors and a vibrant community, Memos is a practical choice for those prioritizing digital sovereignty and privacy.