Like many professionals, I cannot afford to lose my projects and data due to a computer malfunction, cloud screw-up, or anything else. Through dropbox, google drive, etc, I already sync the cloud and computer content, across both my Macbook and Desktop running Windows and OSX. However, I want to add a 3rd medium to back up to in the form of an external drive. If I use rsync in OSX and something like desynchronized on windows to sync the google drive/dropbox folders to the external drive, will that cover all the bases?