With our current understanding, such tasks are comparable to trying to break the speed of light. However, we could probably get incredibly close without any internal data extraction. Our personalities, while highly complex, can be approximated into some simple traits (e.g. 74% 'passive-aggressive', 47% empathy) and replication of our knowledge isn't strictly necessary. Find 10,000 interests and create a int_8 each of how much someone is into it. Et cetra.