These page explains the current export options and what each one does.

Export as JSON

This option will export only your nodes from a microcosm into a single JSON file (.json). This is useful when you need a data format for importing into a variety of systems.

What is JSON?

JSON stands for JavaScript Object Notation. It is a very lightweight format for storing and transporting data.The JSON Format is both human-readable and machine-readable.

Export all to Markdown files

This option will export all nodes from a microcosm as individual markdown files (.md) with some header data, this is useful for importing nodes in apps such as Obsidian.

What is Markdown?

Markdown is a lightweight markup language for creating formatted text using a plain-text editor.

What is Obsidian?

Obsidian is a personal knowledge base and note-taking software application that operates on Markdown files.

Export all to Text files

This option will export all nodes from a microcosm as individual rich text files (.rtf) and a single file called all-nodes.rtf which contains all the nodes from the microcosm, both the single file's and combined file contain some header data, this export is useful for opening the nodes in apps such Libre Office, Microsoft Word, Apple Pages, Google Doc and most word processing apps.

What is LibreOffice?

LibreOffice is a free and open-source office productivity software suite developed by The Document Foundation.