If you need to share or transfer files between Linux machines, you have plenty of options. Here are some you might not have considered.

Really, tarring up Docker, moving the tarfiles, and then untarring the files is what took the bulk of the time for the move.

Instead of re-creating your tar archives when you need to add files, why not simply append those files? Jack Wallen shows you how from the command line and a GUI file manager on Linux.