Trevor has 3.5 TB of data, mostly videos, that he needs to backup. He currently backs up to his Drobo FS. Leo says that the Drobo is a good option, and it can hold a lot of data.
However, Trevor has been using Time Machine, and it just frequently fails. Leo says Time Machine is for beginners, and is not very robust. For a power user like Trevor, Leo recommends ChronoSync.