E* DVRs do not have MPEG encoder capability, therefore, no recording of analog input sources. The satellite stream is already digital, so no problem, and boxes like the 921 can record digital OTA, but not analog OTA or auxiliary inputs.
As for ripping content from the 522, I don't think that's been done yet due to the encryption. There are messy ways it can be done with older DVRs such as the 501 & 508. Go to Yahoo Groups dishmod & dishrip for more.