On two occasions recently I have been contacted by ex-students who for whatever reason were having difficulty piecing together their training history. On both, I was able to filter by student name to produce an accurate copy of the flying, exercises, landings and nav routes appropriate.
All part of the service!
I do, however, double record in a paper log and on a spreadsheet style system that allows me to 'slice and dice' information dependant upon which requirements are needed by that competent authority (FAA/EASA).