I have a VHD image file where I keep some of my data. The file size is 4 GB. Last week I made the initial file synchronized between 3 PCs. Today, I added a couple of files to that VHD, and now after re-scanning btcsync wants to re-synchronize the whole 4 GB of data. Is it an expected behavior? I don't know why, but I expected that in case of big files only parts that have changed would be transferred.