I don't know what ZFS is, but on my Apple system, I have Time Machine set to continuously, incrementally backup my work as I use the system, and I use ChronoSync independently after work sessions to make a more pointed, selective backup of my work to two external archive masters with every photo session. In 20 years worth of image processing thousands (tens of thousands really) of photographs, while I've lost an occasional drive to the gods of malfeasant hardware, I have not yet lost a single digital image.
I have many thousands of film images I made in the time period 1963 to 2002, when I bought my first quality digital capture camera. I keep working at scanning it into digital format whenever I have time, but what I find is that vast amounts of it have degraded to the point of "happy to see for the memory, but too badly ruined by time and the inevitable to do much else with." Once digitized, even all that stuff remains viewable, accessible, for the rest of my Time.
Once I'm gone, I doubt whether
I'm going to be worried as to whether anyone else is concerned with keeping the photo archive maintained.
G