Try this tip to keep unnecessary Dropbox files from cluttering up your Mac
Like many of you, I rely on Dropbox to share files with friends, family and coworkers. When it comes to my coworkers, we have a lot of files we share, and some of them are quite sizable photos and graphics files.
I use a MacBook Pro with flash storage, so space is at a premium. While having access to those shared files is helpful, I don't need all of them taking up valuable storage space locally on my Mac.