What version of Spook are you using?
4.0.1
What version of Home Assistant are you using?
2025.10.2
The problem
At each restart Spook throws a warning that sensor.backup_state is unknown and it should be removed from the automation that uses it (from a blueprint).
The sensor is doing fine, it is up and running, has states and attributes. (happy sensor)
Anything in the logs? Paste it here!