How are notes and bookmarks stored?
Your reading progress, bookmarks, and annotations are saved in
~/.local/share/com.github.johnfactotum.Foliate. If you're using the flatpak version, they should be in
The data for each book is stored in a JSON file named after the book's identifier. If you'd like to sync or backup your progress and notes, simply copy these files and everything should just work™.