tmux-resurrect/docs/save_dir.md

Resurrect save dir

By default Tmux environment is saved to a file in ~/.tmux/resurrect dir. Change this with:

set -g @resurrect-dir '/some/path'

Using environment variables or shell interpolation in this option is not allowed as the string is used literally. So the following won't do what is expected:

set -g @resurrect-dir '/path/$MY_VAR/$(some_executable)'

Only the following variables and special chars are allowed: $HOME, $HOSTNAME, and ~.