For your browser history, sure. But I for one make sure I rsync stuff to a Raspberry Pi4 with an external disk, at my parents place every now and then. In the event of my demise they can unplug it and have all our family pictures and videos. I'm really afraid that I make things to complicated for the people that I leave behind.
I dabble in "life storage" and your comment made me think that some sort of executable shipped alongside backup locations to read the data, if in some deduplicated backup form, seems valuable.
Eg Camlistore/Perkeep had the premise of using JSON to store data. However some random person isn't going to write code to parse all that data, pull files out, etc. A lifeboat .exe might be interesting.
Though doing it in the most simple, least configurable, least breakable way seems.. necessary. Yea some baked in UI would be cool, but more moving parts means less likely to work.
I have the same setup for the same reason as you. Only difference, I have my setup at home. As you say, in the event of my demise, I want my relatives to be able to grab the drive and have easy access to the pictures and videos.