The purpose is that you’ll edit your projects in Brizy Cloud and have them sync to your server instantly.
Consider the alternative for a second:
1. You create a project and to have it on your server, you’ll need to download it from Brizy Cloud (that is possible and it is free for anyone with the Export HTML option).
2. You put this HTML project on your server.
3. Every time you modify something in your Brizy Cloud project you’ll have to re-download the HTML and replace it on your server.
That is just crazy if you think about the time you'll waste doing that every time, on every little modification, especially when the client want's you to test this color, and that font and so on.
With Server Sync (which by the way is also free for everyone), you download the scripts, put them on your server via FTP, and you are done.
Any modification made on that project in Brizy Cloud is synced instantly on your server. Now when the client wants modifications you just tell them to refresh the page (that is on your server) while you are working in Brizy Cloud.
This option is also great to prototype things in real time with your clients.