Default storage: mindix stores your maps in your browser. It uses IndexedDB when available, and falls back to localStorage only if needed.
Linked local files: on supported browsers, you can link a local JSON file and keep writing changes back to the same file.
Browser overview:
Chrome: full linked-file support.
Brave: needs to manually enable via brave://flags/#file-system-access-api .
Safari: linked-file workflow is not available.
When linked files are unavailable, use browser storage plus export/import. Your maps are still editable and autosaved inside your browser.