I have a Pi 4 with HassOS installation. I am using a few integrations there and a few from other servers like dasshio. Also I am using custom integrations via HACS.
I want to change over to SSD boot as the Pi 4 will hopefully allow this.
When I am making a snapshot on my current installation, will all this be restored in the new installation I want to create on the SSD?
Normally yes. If you have samba installed, I would also copy the contents of /config (and the hidden directories beneath) to a safe place, just to be sure.
One thing that probably cause problems : your recorder database. After restore, you will probably need to delete that. A new one will be create after HA restart.