What rotten luck.
I've only recently started keeping a duplicate log in Excel on my laptop,
it took a while to do and I have only around 150 hrs total time.
I will copy this onto disc or two and store in a non obvious safe places,not related to the house,perhaps garden shed ,garage or hangar.
But even if one has thousands of hours it's still worth it in comparison with the hassle of losing it.
Lister