Solved Just backed up email and got some strange looking files

I just backed up my email to external hard drive and got these strange looking files at the bottom of my folders. Do I need to delete them or leave them alone? What are they? It doesn't show in the screenshot, but these files are all 0 KB. So I assume it's okay to either delete them or leave them alone.

Those are likely backed up emails.

That's what I thought. So I should mark this issue as solved?

If you want.