I've recently inherited a Mac Mini 2012, dual core 2.5ghz i5, 4gb ram with 500gb hdd. But I already have my macbook, what to use it for?! I've already set it up as a plex server for films and TV shows as well as a download manager.. I've also set up all the family iOS devices to sync with iTunes over night to back up, and sync new music to some (my own devices use iTunes match anyway). I've also plugged my external HDDs into the mini instead of having to plug them into my MacBook each time I 'dock' and networked these - which work perfectly (even aperture libraries). I've also set one external up as a networked time machine for my MacBook instead of plugging in (using OS X sever). But what else? Seems a waste just for this? Things I'm not sure about are that I'd ideally want to allow my family to access my iTunes match but don't want them signed in to my iTunes using my credit card for their purchases! I also thought about syncing family photos using folder sync which I will probably go ahead with anyway.