Can't get Time Machine to work with Nighthawk

Hi Guys, I finally made it for my Mac to backup anywhere.

I used part of this guide to create a sparsebundle. Then I have put the sparsebundle (remember, it must be formatted the same as the main drive, preferring cryptography if FileVault is on, and choosing a max size). Copy the sparsebundle in any read/write folder on the network drive. Now you can force set the sparsebundle on Terminal. First mount it opening it, and then digit this command on Terminal:

sudo tmutil setdestination /Volumes/VolumeName

Where VolumeName should be eth0MACaddress_hostname.

Now Time Machine is forced to backup on that sparsebundle.

Keep a relyiable link between the Mac and the router or it will get easily get disconnected, LAN is advised for first backup.