What would you want offline to be without internet for a year?

What would you want offline if you were going to be without internet for a year ? Suppose you won't have internet, but you will have lots of computing power and 20 terabytes of storage space. What do you cache offline for a year ? Your goal is to learn, explore, play with the data. To start with: 1. Wikipedia text: 20 gigabytes 2. Hacker news: 6 gigabytes 3. Reddit: 4. All Debian packages with source: 5. All stack exchange data dumps What else ?