windows_timemachine_server.sh

# 1. Create Disk Image
# ref:
# FileSystem type: https://support.apple.com/en-us/HT202784
cd Desktop
hdiutil create -size 512g -fs "Journaled HFS+" -volname "TimeMachine" -type SPARSEBUNDLE -nospotlight -verbose volume_nas_timemachine.sparsebundle
# 2. Move the Disk Image File to Windows SMB Share Folder
# 3. Mount the Disk Image through Network
# 4. Enable Time Machine Not Support Network Volumes
defaults write com.apple.systempreferences TMShowUnsupportdNetworkVolumes 1
# 5. Add Volume to Time Machine 
# if this error, type the command only, drag your mounted volume to terminal for the path
# ref: https://www.reddit.com/r/osx/comments/2bm082/time_machine_to_windows_7_desktop/
sudo tmutil setdestination /Volumes/TimeMachine\ 1

Hi....