Using quantopian for data analysis
You can get data for non-NYSE stocks as well like Nasdaq securities.  Screens are also available by fundamentals(market, exchange, market cap).  These screens can limit stocks analyzed from the broad universe.
I want to know were Quantopian gets data from? 
If I want to do an analysis on a stock market other than NYSE, will I get the data? If not, can I manually upload the data so that I can run my algorithms on it.