I used FreeBSD Boot Environment (BE) for the first time and it's awesome! It allows me to build a kernel and world (userspace), switch to them and in case of failure, revert everything back with just a command. Check out the articles below for more information about it. Managing Boot Environments https://klarasystems.com/articles/managing-boot-environments/ FreeBSD Boot Environments on ZFS https://srobb.net/fbsdbe.html ZFS Boot Environment Introduction https://wiki.freebsd.org/unitrunker/BE Boot Environments https://wiki.freebsd.org/BootEnvironments ZFS Boot Environments Revolutions https://vermaden.wordpress.com/2022/03/14/zfs-boot-environments-revolutions/