WKO4 users often ask for a simple solution to sync data real time among multiple devices, and many attempt to use file sharing applications like Dropbox and Google Drive. While these do "work," they may cause some issues. For example, Dropbox saves a native copy of each file on each machine used, and when WKO4 is closed on any machines, Dropbox uploads the updated version of the files from that machine so that all other machines update. If multiple machines are using WKO4 at the same time, you may lose data/changes because of the automatic updating.
The simplest way to sync data continuously among multiple machines is to sync WKO4 with a TrainingPeaks account(s).