I noticed that Sonos integration utilizes the sonos library snapshot feature.
I would love to see that on SoundTouch aswell.
It’s available in the v8 of the soundtouch library.
In case anyone is still monitoring this thread …
I just developed a new SoundTouchPlus custom component if you’re interested. It can easily be installed via HACS as well. More information can be found in this forum post.
It provides Snapshot store / restore services.