Save file location of Rise of the Tomb Raider [Mac]:
Go to this folder:
~/Library/Application Support/Feral Interactive/Rise of the Tomb Raider/SaveData
Double click to the Steam Saves shortcut. This will take you to a path like this:
/Users/username/Library/Application Support/Steam/userdata/199999996/300000/remote
You will find your save data in that folder.
Software developer. Defender of Kaer Morhen. Based in the U.S.