Google Drive lets you selectively sync subfolders

Google Drive's latest update might be considered a small one but it introduces a useful feature. You can now sync subfolders on Windows and Mac. Previously, you could only do so with top-level folders (e.g. music folder) but not with the folders within these. This gives you greater control over how much data your Google Drive files take up on your computer or how much stays on Google's servers. 

Another new feature is if you delete a folder that has shared files, it'll cut off access to other users. You'll be warned by the app if this happens and allows you to undo the action.

Source: Android Police