Recordings disappear from one of two DVRs - TimeWarner TV

#1
I have many shows recorded on our downstairs DVR, it's probably 90-plus percent full. On the upstairs DVR (Motorola), all of the shows have mysteriously disappeared for no apparent reason. I unplugged power to the DVR, repowered but this did not restore the shows. How can I get my recorded shows back on my upstairs TV?
 
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