If you restore furniture for a living, you clean and repair it to bring it back to its original beauty.
When you restore something, you are simply bringing it back to what it once was. You are not making it better, nor are you adding something that wasn't there. You can restore a damaged reputation, your health, or an old house, though the latter may be easiest of those three to accomplish. If the electricity goes out, you will have to sit in the dark until the power is restored.