The latest release of JACK includes a new feature called “JACK Session” which allows the creation of “session manager” applications that can snapshot an entire JACK session, and then restart them en masse at a later time. If you’re using Ardour in combination with some external software synth or FX application, JACK Session allows you to store the state of all the JACK applications at once, and then later, restart the exact same setup to continue working smoothly.
JACK Session is still a very new feature for JACK, so the tools to manage sessions are still under development, but QJackctl, the most commonly used JACK control tool, already has support for this.
Ardour 3.0 supports JACK Session and so can be a part of more complex session setups that are saved/restored in a single step.