The data is compartmentalized, he probably did not have an easy way to exfiltrate it. He had a good portion of NSA data available without too much suspicion, du

The data is compartmentalized, he probably did not have an easy way to exfiltrate it. He had a good portion of NSA data available without too much suspicion, due to his position. Most CIA or NSA employees did not ever get that much access. There's probably a motivation factor as well.