Baboon boy, what I earn an hour is neither your concern or business.
Also i'd be very surprised if you can program Excel in one hour to do everything that Logbook Pro does, if so congratulations, new business on the cards!
Thanks for your concerns about my current system but it is no more risky than having a paper logbook stolen or lost, so hardly a disaster if the phone goes missing because I could update my records from the paper logbook or vice-versa.
using your same theory what would happen then if someone broke into your house and stole your PC??, disaster waiting to happen?