I'm not the world traveler I was, I still get out now and again but not as much as before.
On all my journeys the two most irreplaceable items (apart from my life and health) have been my camera and my journal. I have lost neither (permanently anyway).
Back in the days of film I would write a postal address on all my 35mm cassettes, these days the first photograph on all of my memory cards is an image of an email address and text indicating of a small reward for the images on that card.
As most cameras can readily photograph documents and have ample storage I will often take the time to photograph the pages of journals, drawings, notes, maps etc. And as internet access is surprisingly ubiquitous everywhere I will often upload my memory cards to a spare google or dropbox account.
Some folks are travelling to climb mountains and are carrying several thousand pounds worth of climbing gear, others may be packing very expensive camera or video gear. In cases such as these Pacsafes and the like may be of use and probably won't way you down any more than you already are.
If not, travel light, buy local and enjoy the journey.