There should be a file on your PVR hard drive that is the timeshift buffer file.
View a channel for a few minutes (5 or 10), then shut off the receiver. Disconnect the PVR hard drive, and reconnect it to a PC. There should be a recorded timeshift file there.
If you find you're viewing something that you want to record, DON'T hit the record button. Just keep watching until the program ends. At that time, turn off the receiver. Connect the PVR hard drive to a PC, and copy the timeshift file to another drive connected to your PC (or the internal PC drive). You must copy the timeshift file before you reconnect the PVR hard drive to your receiver, since the file will be immediately overwritten once you turn on the S9.