That's what I use on ubuntu 12.04 and it is great. Only problem is that if your directories overlap inside dropbox, they count twice. I'm rarely above 50gb tho

That's what I use on ubuntu 12.04 and it is great. Only problem is that if your directories overlap inside dropbox, they count twice. I'm rarely above 50gb though, so doubling a random directory (like linking my camera uploads to photos) is never a problem.