Huh an empty folder that containers 42.8 GB?

Empty folder with huge file size. Why is that?

Open Windows File Explorer, click on the View Tab, go to Options and make sure you are displaying Hidden Files.

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Also get a Trial License for Tree Size (Jam Software) and look at your drive with Tree Size. That will find large (and hidden) files and should expose a very large file. Local backup files are usually hidden and are large files.

I use Tree Size here and it is a good tool for this.