my time capsule says it is not available
My time capsule is connected to my wifi router by ethernet. Recently it stopped backing up and the preferences says it is not available. Airport utility shows the time capsule connected correctly. but 'base station tab shows yellow and 'Back to My Mac' is not available in this version of macOS. Click delete to remove your iCloud account.' I am not sure what this means but don't want to delete until I understand what I am doing!