Come on guys, we are talking about a garage, not MI5 or the Pentagon. Electronic data is just as easily "tampered" with as paper. Infact, a piece of paper knocking around a filing cabinet for a year is going to show signs of age, and any new additions to it will stand out like a turd on a bowling green. Electronic data shows no such ageing. If you are really expecting a garage to have encrypted, locked away, stored off site, top secret classification dyno reports, then someone will have had to do that, and they will know how to undo or remove that protection, and therefore tamper as easily as they could before. Having an electronic copy of the info is no more use than having a hard copy, simple as that really.