Today I installed BT Sync on our company NAS, a Synology DS214+. Everything works fine, but I noticed a strange thing when browsing the files on the NAS. The NAS is the 'host' of a folder; say btsync/, and a Windows PC is connected using the Windows application for Sync. On the PC we added a folder; say Subdir/ to btsync/. When we changed the name of Subdir/ to subdir/ (note the uppercase S), on the NAS both exist. So when you change the name of a folder, but only uppercase/lowercase, it makes both folders to exist on the NAS, which is a Linux device.