Synchronize files (code) on the local computer with a remote server

Almost all the code that I write usually runs on a high-performance server. Recently, I just remotely coded through the NoMachine NX remote desktop (similar to VNC), and the delay in scrolling through the code and typing became unbearable.

Are there any suggestions on how I can set up a local folder that syncs with a high-performance server every time I save a file? Something similar to Dropbox, but I can apply to any folder.

You need to work with Mac OS X and Linux Ubuntu.