Chances are, you set up a catalog when you first installed Luminar. The catalog contains all of the information about your files including metadata like ratings and labels as well as any edits you make with the tools.
Remember, the edits you make in Luminar are always nondestructive when you work with a library. This means you are not changing the actual files but rather capturing the instructions into a database. When you are ready to share or use the file elsewhere you’ll export the image and apply the edits.
The contents of a catalog are stored inside a folder. If backing up or moving the catalog, be sure to take the entire folder.