Since I use my DVR all of the time when it's not connect to the satellite (I like to be able to watch the recorded programs while we are driving) I can tell you as an absolute fact that you CAN use your DVR while not connected to the satellite(s).
However, your DVR must maintain power between the time you have a working satellite connection and the time you want to watch TV. For me, that means I have the DVR on an inverter and it never loses power and I have full access to everything on my DVR at all times and in all locations.
