It is convenient to be able to roll back to the VM's known-good state. Such states are often those where VM was known to have been shut down or savestate'd. Since this is an SMF wrapper for Solaris, we're likely to use ZFS as back-end.
New feature (off by default as to not waste disk space) allows the admin to list ZFS datasets related to this VM (i.e. ZVOLs) or have them autodetected (paths which contain the VM's config files, VirtualBox snapshots and HDD disk images), and tries to create snapshots of each such dataset - if it is indeed ZFS-based. Works with pathnames (i.e. over NFS) and dataset names (pool/data/set/name).
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