Syncthing is P2P, you're not meant to run it on a server in the cloud. You run it on each device like your laptops, your NAS, your desktop computers, etc. and

Syncthing is P2P, you're not meant to run it on a server in the cloud. You run it on each device like your laptops, your NAS, your desktop computers, etc. and it will connect each of them together P2P to share files. You can of course run a server in the cloud that is always on and sharing your files but it's not the primary or required way to use syncthing.