I have an MBP for school and an iMac for homestuff. I download different stuff on each of them, like apps and songs, and I like to do word processing on it as well, so i often transfer documents from the MBP to the iMac w/ a usb-stick, which is very inconvenient. I want an app that scans the system on computer Y and compares it to the system on computer X, then copies the files it doesn't find there to computer Y and vice versa. Is there something that does this pretty easily and seamlessly? Thanks in advance.