You can record in real time via composites or s-video. If you are asking about transfering files via the usb port, receivers are not set up to do that. There are people who say it can be done, but that is Hack Talk and is now allowed here.
By the way, that means it will record premium channels, over the air & pay per view, etc................
It will, but remember, it won't be in HD any more, so you will loose PQ. Still, I know a couple of people who do this with their 522/625 SD DVRs and are quite happy with the results, though it is a tedious process.