I need to be able to sync everything on my MacBook to my iMac, but not the other way around. For example, I use my MacBook for DJing and any new music that I get will be through my MacBook, I want the iMac to have it as well, what I don't want is to sync everything from the iMac to the MacBook. My wife will be using the iMac for pictures and I have no space for her 100,000 pictures, I am not kidding, and videos. How can I do this? Do I need anything else. Will I need to buy a Time Machine, or will Time Capsule do the trick?