Next we'll install Netatalk. We need version 3.0 or higher, which we'll build from source code. Open the Epiphany web browser from the left end of Raspbian's Task Bar and go to netatalk.

In Disk Utility, select the external volume, click Erase, name it 'Time Machine', select OS X Extended (Journaled) and GUID. Click Erase. In Terminal, enter sudo chmod 777 /Volumes/Time\ Machine && ls ...