I did not claim to be qualified. I am terrible at using computers, I don't like them and I am a mere user who does not want to care for anything concerned with them. However, if I come across some newspaper articles who are written by people more qualified than me in this field (which is terribly easy) which tell that Dropbox is, for whatever reasons, unsafe, I just try to get an alternative. I am not interested in the discussion on why or why not these claims are true or not, I simply want to be on the safe side and the easiest thing for me to do so is not to use dropbox but another program which could be more safe than the one under suspicion.
Thank you for mentioning BitTorrent Sync. I think I'll fare with this one.