Hi,
normally the camera assistant runs it. The best thing is, to have enough cards to cover one days shooting.
Always double back up on two seperate HD’s, make shure you don’t copy one contents folder double and leave another not copied.
I make one copy of the original contents folder on one HD, on the other I import the P2 files via FCP.
Rainer
3 years work experience with P2 without one lost file.