I was wondering this too. The HMC150 doesn't have firewire, but it would be nice if there was a device that could capture HDMI or component out of the camera. Something with a capacity of 160-250GB. I know Aja makes the Ki-Pro but I don't have 4k for that.
You can use HDMI capture boxes with a computer for less than $500... but as far as being remote - you have to shell out the doe. There are a few options around $4000.
If you want to output for lower compression and higher quality, then you'll want a nanoFlash. Almost the price of the camera. Eek! But well worth it, from what I hear. Now if I could only find a rental house in my area that carried it . . .