Unless some mathematics/cryptography genius finds a vulnerability in the AES algorithm, or we improve processing power by many orders of magnitude, AES-256 is going to be immune to nation-state actors for decades or even hundreds of years. Right now, trying to break something encrypted with AES-256 is pretty futile. Even if you pointed every processor in the world at breaking it, you're likely to reach the heat death of the universe several times before succeeding.