Automatic Backup Failure - duplicate item error for data['location']

I’ve just noticed that my backups stopped working 3 weeks ago, and when I tried to create an automatic back it fails straight away with this error:

2025-03-14 16:43:37.665 ERROR (MainThread) [homeassistant.components.websocket_api.http.connection] [139912928185216] Error handling message: Error creating backup: contains duplicate items: [None] for dictionary value @ data['location']. Got ['.local', '.local'] (home_assistant_error)

Creating a manual backup works ok, but an automatic one doesn’t:

My backup settings look like this:


Does anyone know what this is referring to please?
data['location']. Got ['.local', '.local']

I’ve updated to the latest 2025.3.3 but I still see the same backup error.