Correct me if I am wrong, but NO you can not rewind a program that is on when you come home if your receiver is in sleep/standby mode. If you run to the store (leaving your receiver on and your TV off), and come back and turn your tv on and wanna rewind the program you can, however you can only do it up to 1 hr for HD-Dvr's or 2hr's for SD-DVR IIRC. Dish receivers only buffer whats on when the receiver is on, ie: the lights on the front are lit up.