I was thinking about this on the weekend.
I spoke to a JP who said one of two options:
Ideally I was going to take a photocpy of each page and he will sign it then I can keep those in a seperate location.
Second though he would do it, wasn't 100% keen until he had seen what was involved., he would sign a computer printout of my hours showing total and confirm that that matches the totals in my logbook (along with endorsements etc.).
I am however going to go out and get a fireproof safe at somepoint.