Why?
P2 is just an acquisition format like HDV, XDCam and others, all variants of 2 temporal codecs (H264 and Mpeg 2).
HDV is recorded to DV tape and one could back up back to DV tape if one wanted, but I cant see the value in exporting back to hard drive or media cards using an acquisition format rather than a target format like H264 or Mpeg 2 for BD or Windows Media for web or local playback.
Now if this discussion is about cross platform editing, I am out.