Click on the Dropbox icon in your menu bar or system tray. Click on the gear icon and then select Preferences. Click on the Sync icon at the top bar Unclick every folder marked and leave clicked the ones you want to synk on your computer. Dropbox will erase every copy it made on your computer and will not longer create files on your hard drive.I I had the same problem and I just figured out how tofix it. Good Luck.
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