I have no experience with Akeeba backup.
What you can do best is going to http://localhost/phpmyadmin
on your windows pc (assuming that uses XAMPP also) and export your database to a SQL file.
And on the mac you should also go to http://localhost/phpmyadmin
, create a database and import the SQL file.
You might also need to edit the Joomla configuration file. I do not use Joomla anymore, but I remember that in the configuration file there were also some path settings (telling Joomla where it's located). You should set the path settings to something starting with /Applications/XAMPP/xamppfiles/htdocs/
I hope that this helps.