Deployment downloading/synchronizing

I have a PHP project set up on a local folder that is attached to a mapped drive in Windows which points to a remote Windows server, and I only use the project every few days so I need to synchronize (download), but I can't tell if synchronize will only download new/changed files or will also upload files from my local.

Also, I don't want it to download files that haven't changed from remote, but I'm not seeing an option. There are hundreds of thousands of files and I don't want it downloading redundant files.