I'm old enough to not trust ICT completely & ICT experienced enough to hard- & soft-copy essential documents. So that's a single page hard copy of e-tickets & other items (travel insurance, rental vehicle reservations, transfers, accommodations etc, & if for overseas, of passport, credit cards, driver's licence etc - all of which stays in a plastic sleeve on my person) plus a back-up of those on a memory stick, also separately on my person.