ZFS supports snapshotting and rollback, meaning failed upgrades can be rolled back (by booting with another ZFS capable image). ZFS supports send and receive,

ZFS supports snapshotting and rollback, meaning failed upgrades can be rolled back (by booting with another ZFS capable image). ZFS supports send and receive, meaning a volume can be sent to another ZFS pool for backup. Compression can save on disk space, and in some workloads be a performance benefit trading CPU cycles for IO savings, but this is probably more beneficial on data volumes compared to system volumes. All of the above will be dependent on any limitations present in the options the installer provides, which apparently will be expanded in the forthcoming 20.04 release.