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@Gabriel > I'm sorry to hear about that, but unfortunately there is no tool or easy method to restore your music from the export device, which is why we strongly recommend regularly creating a backup from within rekordbox, or using a 3rd party backup system such as Time Machine or Backblaze.
You could copy all of the music from the (hidden) Contents folder on the USB drive into a Music folder on your hard drive, but it would likely be in an ugly folder structure, and you will not be able to recover any playlists, cue or memory points, and all grids would have to be rebuilt.
Please let me know if you have any other questions in this process.