Many years ago at a Sydney SMPTE show, I saw Sony showing off a data storage system, strangely called a Petafile. It was a bank of HDCam machines with a robotic arm that was streaming data to four tape machines and a bank of tapes, so it was like a giant multi tape backup with control software. When I pointed out the problem with the name, they may never have shown it again under that name.
I haven’t seen anything for a digi beta deck and I presume that the data would need to be embedded in a digital video stream, like the original PCM audio recorders. Have you spoken to any techies at Sony?