No mount with Nautilus from standard user

[UlfZibis]

/etc/fstab : UUID=xxx /media/Backup ntfs defaults,noauto,users,windows_names,hide_dot_files 0 0

I have followed the instructions of:
http://www.tuxera.com/community/ntfs-3g-faq/#useroption

addgroup ntfsuser
chown root:ntfsuser /bin/ntfs-3g
chmod u+s,o= /bin/ntfs-3g
# chmod 4750 /bin/ntfs-3g
usermod -aG ntfsuser standard-user

chown root:ntfsuser /media/Backup/
chmod g+w /media/Backup/

ls -ls /dev/sda3
==> 0 brw-rw---- 1 root disk 8, 3 Jun 22 21:35 /dev/sda3
# Alternative 1:
usermod -aG disk standard-user
# Alternative 2:
chown root:ntfsuser /dev/sda3

# Works fine then:
standard-user@PC:~$ mount /media/Backup

# But click on Backup in Nautilus asks for root password :-(