Your files

Everything QuillArk stores is in a format you can open without it.

Books/
  My Series/
    project.yaml            the project settings and categories
    Books/
      01 - Book One/
        book.yaml           this book's details
        Manuscript/
          manuscript.yaml   the reading order
          Body/
            0001 - Chapter 1.md         your prose, nothing else
            0001 - Chapter 1.meta.json  its summary, status and word count
    World/
      Characters/
        wren-ashgrove.md    one record, with a YAML header
    Research/
    Mind Maps/
    Tasks/tasks.yaml
    Calendar/events.yaml
    .quillark/              revisions, caches and the search index

Chapters are plain Markdown with no header, so opening one in Notepad shows your writing and nothing else. Records that are mostly information, such as characters and notes, keep their details in a small YAML header at the top of the same file.

Everything in .quillark can be rebuilt from the files around it. If you deleted that folder entirely, you would lose no writing.