The data is integrated into the Internet archive and available e.g. via the way back machine. Not sure if you can get the whole reddit dataset.
The archive warriors are downloading Reddit for a while already. 15.6 billion items and counting. You can help too:
Banned in the EU since 20 years, in Germany more than 30 years. Strange that this is so different in the US
Over the internet for file sync. Desktop devices.