What happens if I export the library AGAIN ?

So if I perform a library export and all these extra files are created in my storage structure, this sounds like it will work great for importing after a Windows rebuild, but I have some questions.

1. Will the “watched” status be exported/imported along with the basic info?

2. If I later perform another export, will the files be overwritten? or will it cause confusion?

3. There seems to be a long-standing problem with single-file export….is anyone looking into this?

What are your experiences with this?