The path for backups to MAC is as follows:

At the top, window: "Go", then press: "Alt" this displays library (which is in "go").
Go to: "Application support" then in "unity-microids.Syberia3"

Or

Open library (to do this apple + Go to); Containers; Com.microids.syberia 3.macstore; Data; Library; Application support; com.microids.syberia3.macstore

Savegames :

http://dl1.anuman.fr/patch/Syberia%203%20-%20MAC.zip

Savegames by zones :