GreatMarko, thanks. I did want to sync some of folder1, just not the large folders. I've tried doing as you said, and the folders are still being indexed and synchronized. Are the paths in the .syncignore file supposed to be relative? Does it matter if the slashes are front or backward? Seems I've tried all variations of these and the folders I'd like to ignore keep syncing. I've tried: E:\Projects\folder1\sf1 E:/Projects/folder1/sf1 E:\Projects\folder1\sf1\* E:\Projects\folder1\sf1\*.* \folder1\sf1\ \folder1\sf1\* None of these seem to be working for me. Once I've tried them, and see that the unwanted folders are still syncing, I remove the folder from btsync and close the program. Then I would try a different variation and restart btsync. The .syncignore file is supposed to be at the root of the folder I'm sharing, correct? (E:\Projects). Seems like I'm missing something very simple here.