I've long been looking for a way to backup my data of around 1.5tb of video and audio. I'd like to use btsync for this and was thinking to mirror the data between two external USB drives, one attached to my laptop and the other to my desktop, since they both feed my collection depending where I work. Since my phone is the only device that will share uptime with both of them, I was hoping if maybe there exists a possible btsync setup that will make my phone update changes between the two USB drives. Obviously my phone can't store 1.5tb, so it should only transfer changes and flush this data when done. Is this possible? Is there a better way to do it? Thanks in advance.