Syncback
Goodsync
Recently, A complication has occured that has caused me to have to move between households every couple days(my FC's engine is sad now). Because it was getting annoying to load my full tower and Equipment into my FC every couple days and drive all over with it. I put it at my Main Household and bought a laptop. Took one of the MANY servers i own and made it a private FTP(currently 10 TB). Problem is this. I want a software that can syncronize the laptop and tower to the Server that is free(software that dosen't replace all files, but checks the current files with the server files and updates the files that have been changed). Thanks. BTW both are PCs.

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic