I *think* this is the procedure but someone may have to confirm the steps.
Put in your external NTFS drive into a USB port and make sure it works
Create a new mount point for the NTFS drive
sudo mkdir -p -m2777 /media/static/Backup
find the name of your NTFS drive
cat /etc/mtab
find your user id in and note the gid and uid
id
Edit fstab
sudo nano /etc/fstab
to (dev/sda1 is your name that you noted above, /media/static/Backup is the mountpoint you created and uid and gid is your user details)
/dev/sda1 /media/static/Backup/ ntfs auto,users,uid=1000,gid=100,dmask=027,fmask=137,utf8 0 0
Install Samba
apt-get install libcups2 samba samba-common cups
Open Samba configure
nano /etc/samba/smb.conf
remove everything and alter it to (change 'orangepi' to your username)
[global]
workgroup WORKGROUP
security = user
interfaces = lo eth0
bind interfaces only = true
map to guest = bad user
usershare allow guests = yes
force user = orangepi
[Public]
path = /media/static/Backup
writable = yes
browsable = yes
guest ok = yes
guest account = orangepi
public = yes
read only = no
create mask = 0775
directory mask 0664
[home]
path = /home/orangepi
writeable = yes
public = yes
only guest = yes
Reboot and test