You can install SSH clients (probably already installed) and servers on all computers. The hardest part is configuring the router so that every computer always is given the same IP address. If we are talking about computers on different networks, the router must also be configured to transmit incoming connections to the correct computer (SSH's default port is 22 but you can use a different port; you have to do so to access different computers in a network that is not the one you are in). You can finally add bookmarks in the file managers to connect to your home folders on each of the remote computers.

In GNOME's file manager, click on the gear button, then on "Connect to server.." and specify "sftp://"; followed by the IP address (the private address of the computer inside the same network, the public address of the router if in another network), optionally followed by the path to the folder. The port, if not 22, has to be specified at the end, after ":".

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