dropbox destroys files: what did I do wrong?

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http://www.linuxquestions.org – Friends-- A saga in which our protagonist (me) loses thousands of files and has no clue what he did wrong, and hopes someone in this realm can point out to him the quicksand so he does not step in it again.... Have used dropbox for 2 years or more in a production environment, with ne'er a lost file. Recently I got the bright idea to use it to back up much of my data files. Desktop (D) box is connected via cifs to Ever at the Ready server (E) for data files. D is connected to Web and to dropbox. Not wanting to duplicate all E's files on D, I did ln -s /path/to/server's/data/files in my ~Drop (HowTos)