Arch linux AUR packages

i installed urbakup2-clien-no-gui on arch linux from aur repo.
starting urbackupclientbackend.service i’ve got an error “failed to locate executable in /usr/local/sbin”.
the executable urclientbackupclient is located into /usr/local/bin instead of /usr/local/sbin.
should i modify service startup script or create a symlink into /usr/local/sbin or i should use the .sh script downloaded from my server?
thanks for helping