While filesystem snapshots are often used on FreeBSD to take a snapshot of a working system prior to an upgrade, there are alternative ways to make sure of snapshots which prevent making changes to the running system. The V𝚎𝚛𝚖𝚊𝚍𝚎𝚗 blog provides a tutorial for upgrading the FreeBSD operating system using ZFS snapshots and a chroot in order to install a new version of the operating system which can be booted in the future while leaving the running sysetm unchanged. "Having 12.2-RELEASE installed I wanted to check 13.0-BETA to check if things that are important for me - like working suspend/resume for example - work as advertised on the newer version. It is the perfect task that can be achieved by using ZFS boot environments. In the example below we will create entire new ZFS boot environment with clone of our current 12.2-RELEASE system and upgrade it there (in BE) to the 13.0-BETA3 version and there will only be required one reboot - not three as in typical freebsd-update(8) upgrade procedure."
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