I have two Macbook Pros that I regularly use, one for high performance and the other for battery life. I need a good, thorough, reliable program that will scan my computers for changes and transfer new files. I usually end up making several documents in one school day, and it's been getting irritating using a USB drive. When I don't do this for a while, I usually have 50-100 files that I end up transferring with Time Machine. Please help. Thank you!