The linkback can be forced even if the target doesn't exist.
Using the * syntax before a linkback target will cause the
linkback to the target to be created even if the target doesn't
exist at boot
time.
Since oneSIS creates these links before any other system
initialization is done, remote filesystems specified in
/etc/fstab are not mounted yet. The * syntax can be
especially useful to point to locations on a network filesystem that
hasn't been mounted yet.