Which real-time sync app for Ubuntu is similar to Dropbox?

Question

ubuntu

There is a synchronization task between a computer (Ubuntu 16.04) and a server (Nas4Free). I'm trying to find an application that can synchronize selected folders on a computer with a folder on a server. Just synchronization, as a client application does, for example, Dropbox, Nextcloud, Yandex.Disk. It is necessary that it hangs in the tray and tracks changes in folders, transferring everything to the server. It doesn't matter what protocol - smb, ssh. For Windows, not immediately, but found DSynchronize. For Ubuntu, apart from various variations of rsync shells with "on-demand" synchronization, nothing else has been found so far. Of the console ones, I liked realsync - it does what it needs, but it can only track one folder, there is no GUI and it requires an open terminal to work.

Answer 1

Look at syncthing