oh my.. everything work properly. case closed thanks for your help.You don't need to reboot or run systemd command. Just make changes to /etc/fstab and try to mount the directory. My mistake wasdefault
should bedefaults
(with ans
at the end). See The fourth field in fstab for more information and options.
i even did a reboot on everything to be sure everything stay mounted if something bad happen. backup done ! note taken. ty for all the help.