Szerintem jó lesz az a nofail:
man systemd.mount
The NFS mount option bg for NFS background mounts as documented in nfs(5) is not supported in /etc/fstab entries. The systemd mount option nofail provides similar functionality and should be used instead.
If the bg option is specified, a timeout or failure causes the mount(8) command to fork a child which continues to attempt to mount the export. The parent immediately returns with a zero exit code. This is known as a "background" mount.