You can (usually) run your remote tmux in a window in your local tmux session; then you can use the local tmux session's copy/paste features. I commonly run "s

You can (usually) run your remote tmux in a window in your local tmux session; then you can use the local tmux session's copy/paste features. I commonly run "ssh remote-system" in a tmux window, then attach to a tmux session on the remote system. If you nest tmux sessions like this, you have to type the prefix character (Ctrl-B by default; I use Ctrl-Space) twice for the nested session to see it.