Here is how it works in a little more detail for Mac Os X Yosemite users: [01] On my WD My Cloud EX2 (Nas) make a folder called Colors & add it to the BTsync via the http://pcloud.local:8888/gui/index.html web iterface. [02] on the Mac computer_1 the 'Colors' share will appear in the default btsync folder. right click and disconnect. [03] on thw Mac cumputer_1 press connect on Colors folder (via the BitTorrent Sync App) & choose a location to sync to. This new location is ~/Library - btsync will try to create the folder called 'Colors', but will tell you it already exists & gives you an option to keep the contents. [04] rinse & repeat steps [02 + [03] on Mac computer_2 It appears to work fine, after some shorts tests.