I lost two of my logbooks. The first one, the time had already been entered into the new one on the first page, so not a huge deal.
The second one was a much bigger lost. I had been using an early electronic logbook (AeroLog Pro), but the paper one was primary. When I went back after a 20 year hiatis from flying, I realized I had been about 2 years behind on entering my flying in my electronic log book. I was able to recreate some flying, like going to Ohskosh, but lost a good bit of time.
Oh well.
Now I log electronically first in Safe Log Pro. One reason I picked them is they were able to import all my entries from Aero Log Pro. I enter on any of my electronic devices, and then sync with their cloud. And then I sync all my other devices, so I end up with about 6 copies. So unlikely to lose all of them. Every week or so, I update my paper logbook also. That does NOT go with me in the plane, unless I am getting dual.