My concern would be reading the data later. Zip files are sill ubiquitous and easily supported by all major OSes (though not mobile, so be slightly careful). With ZFS, you might have to first deal with reading off old hardware (luckily SATA looks like it has at least 10 more years) and using an old OS version to mount the pool.
ZFS seems like it will be a well supported fs for decades to come to me, but in any case I wouldn't actually stuff a drive in a cabinet somewhere and have a look 30 years later. Somewhat regular checks and moving to newer media is still generally a good idea I think.
