The new launcher explained

Home: When opening the launcher, it first checks your NAT type and connection. It will take a couple of seconds. Once ready, the Play button appears.

Services: Here you have the useful ability to upload your savegame as a backup. It will be stored on your account and can be downloaded at any time.

Note: It won’t automatically upload the savegame, so every time you wanna backup new progress you just press upload.

Discovery: This is the built-in mod manager that lets you download mods. Not all mods are on the launcher however, you can find more on turboduck.