It seems fair to assume that they can decrypt most encrypted data, by brute-forcing with that computer power. Most passwords are in the top million used passwords. Long passwords are often sentences which must be setup in a way that a human must be able to remember, that narrows down the available passwords a lot. The methods used by people to create new passwords is not very long. If you create a brute force engine that works it's way through this list combined with the normal dictionaries etc it must be very easy for them to decrypt a large percentage of all AES-256 encrypted archives. Especially when well known or very short passwords are used. Of course if you are smart you can make it more difficult. but just imagine, if they would try to brute force let's say 10000 truecrypt encrypted Archives or zipfiles each of another average encryption user, how many do you think can be decrypted easy this way? From the things i've seen , i expect a lot. Of course i oversimplified this a bit, but you know what i mean.