I got all my books on all my devices where I can possibly read on. Only my tablet is updated reguarly (only because that one contains my entire Calibre library, including Calibre, which is stored in OneDrive). My T68 (android) is update often, as that is easy, wireless using Calibre Companion. The H2O requires an USB cable and I can hardly open that compartment (the drawback of a watertight device
) so it only gets updated when I really want that book on it.