I'd used BT Sync for a couple of weeks to sync data between my own machines. It works neatly. One question here. When you modify some part of a big file, does the program send out only the difference to the other authorized machines, or entire file? Let's say a researcher exports her data to a 1GB CSV file of my interest. I download it. In the following week the same researcher updates her CVS with more data, now it has 1.01GB in size. How big my next download will be?
Seems as though it supports patching so only the parts that are changed would be synced. Of course, the download size is completely dependent on what parts of the file were changed.
http://www.bittorrent.com/sync