Install Syncthing on Debian Jessie or Stretch.

Syncthing is a great tool for liberating your data from cloud storage providers. While Dropbox, SpiderOak, and Google Drive are great services, the trade-off for such a great and simple product is privacy and loss of control. Syncthing can get you the main function of these services (automated file syncing between systems) without the need to give up control of your data to a third party.