A recent business announcement won't help you much, since it's something only available in Japan; but the "quoted capacity" may suggest something of what you need for storage:

Toshiba to sell 5TB home media server in Japan

"Toshiba said the server can hold 15 days of digital broadcasts from six channels, and stream them to its TVs and tablets."

"By Jay Alabaster | 03 October 11"

Desktop USB Drives are available with 5TB storage, and might help with the home storage; but as has been discussed you'd likely want redundant backup regardless of media used.

John