One of the reasons why I wanted to run HASS is incase my internet goes down I want to make sure things are still running.
Can you verify if these would still run/work if the internet is down?:
-Hook R/F -Harmony Hub -Samsung Smartthings -Zigbee Entry and Motion Sensor -Nest -Schlage Connect Deadbolt -GoControl/Linear GD00Z-4
I would just give it a try.
Anything that talks to the cloud will proobably not work if your internet is down (Smartthings) Otherwise, if you have setup RF/Zigbee/ZWave to talk directly to your HASS on local network, it should all still work,