1) Format the external USB disk (320GB) in "Mac OS Extended (Journaled)"
2) Enable the "HFS+" Writable to external USB disk. How to do it?
a) mouth the external USB disk (320GB) to Mac computer
b) open Terminal and disable the Journal > "sudo /usr/sbin/diskutil disableJournal / dev/disk1s2"
c) insert the external USB disk to iUSBport / CloudFTP device and connect it to iDevice or computer.
d) open up Safari Browser and go to the iUSBport / CloudFTP web app interface.
(In the example below, the iUSBport /CloudFTP is running in Infra mode with the IP address
e) tap "App" and select "HFS Writable"
f) enter the "Enable Writable" which makes the external USB disk a writable disk in HFS/HFS+ format
3) Open Terminal and create a disk image in Desktop screen from Mac computer
*A 120GB size in HFS+J format is created and name the disk image as "MacBook-Pro-Backup.sparesebundle
4) The disk image of "MacBook-Pro-Backup.sparsebundle" is created in Desktop
5) Select the disk image and right click on mouse, select Open with > Disk Utility
6) Repartition the image disk and name it. (Name: Samba Backup)
7) Command "K" (connect to Server), type in the SAMBA server address (the IP address displays on the iUSBport/ CloudFTP unit)
8) Connect as Registered User and key in Password, hit "Connect"
9) Drag the image disk from Desktop into "CloudFTP-C"
10) After copying image disk is completed, double click the "MacBook-Pro-Backup.sparesebundle"
11) Then the "Samba Backup" is mounted under Devices
12) Go to Terminal > diskutil list > to identify the location of "Samba Backup" device
13) The "Samba Backup" IDENTIFIER is disk1s2 from the list below
14) To enable the ownership of Samba Backup > "sudo diskutil enableownership /dev/disk1s2"
15) Lastly, move the "Samba Backup" device as a backup destination for Time Machine
16) Type "sudo tmutil setdestination /Volumes/Samba\ Backup"
17) Turn On Time Machine and select the "Samba Backup" to prepare backup