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Even though, there is a command line interface on linux (which has start, stop and, soon, pause options), there seems to be no equivalent feature on windows nor on mac. This feature should be easily ...
Another reason for command line usage is "Locky" and all the other encryption viruses going around at the moment. I don't have experiences with it (and I'm glad about this!) and don't know how the dropbox syncronization deals with it. But I guess that for protection of data a batch-based linking and dislinking of the dropbox connection is very helpful.