These steps will help you exclude a folder from syncing:
- Lets say you have a folder that you want to exclude called NON_CLOUD.
- We first create an empty folder that is renamed to NON_CLOUD and place it into Dropbox.
- Then, we use selective sync to unsync that folder: https://www.dropbox.com/help/175
- Next, move your actual NON_CLOUD folder into the previous location of the empty NON_CLOUD folder.
- That folder will have a grey circle with a “minus” sign and will not be synced to Dropbox.