I have a small remote office that has our R&D dept. They have a bunch of solid works files on their PCs and use a removable hard drive as a data source/backup device. I'd like to get a small server and put it in the remote office and use my vpn tunnel to do an incremental backup every night of the files that they have changed. What would I need for software? I have symantec backup exec 12.5d and I hear windows has built in file replication?