I don’t think you can beat a hardback, hand written Logbook when it comes to looking back in years to come. That having been said, e-logs and/or spreadsheets certainly make extracting data somewhat easier. Just remember, if you’re a Luddite like me and prefer good old paper and ink, to keep a photocopy of your Logbook pages somewhere safe just in case the worst happens and the originals go missing or are destroyed (Dog, Fire, Plague of Locusts…).