I follow these instructions
But I stopped at the very last step. I am asked twice to give user/pass: First, when I connect to the shared "TimeMachine Pi" (all good);
Then, after adding the RPi as capsule I am told
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Firstly, I cannot help but wonder why you would want to do this. I find a directly attached disk using Firewire 800 slow enough, let alone over the network. Initial backup can take hours.
However, I would suggest that you first attempt the access the disk from Finder using Appletalk. I use
but substitute the IP address of your Pi.
You will be prompted for the Pi username and password. You can then opt to save these in your keychain, so future logon is easier.