First, of course, IMHO you have to carry your paper logbook anyways to document at a ramp check that you are legal to fly. I know there is some effort towards electronic logbooks, but I seriously doubt time is ready for this at private pilote business. I do keep a paper logbook plus a MS Excel backup datasheet, stored centrally in the MS cloud solution - for once to do the overall calc of several currencies etc and for second to have an additional backup - but don't like web applications for that, just feeling (even was ramp checked away from the aircraft without the paper 'book in hand and the checker was fine with looking at the iPad accessing the MS cloud electronic backup - this is only happening in practical thinking countries ! ...).