Steam Cloud is officially listed
The full Steam release lists Steam Cloud as a supported feature. That means Steam can synchronize supported save data; it does not promise manual save slots or an undo history inside the game.
Players describe an autosave-first system
Community requests for manual save points describe progress being saved automatically and overwritten rather than exposed as a list of checkpoints. Until directly verified, treat that description as a current player report rather than a permanent specification.
Protect evidence before troubleshooting
Note the active client, build, last completed action, and whether Steam reports cloud synchronization as complete. Avoid repeatedly starting and closing the game if you are trying to preserve a reproducible problem for support.
Do not promise a local save path yet
Operating system, store configuration, and patches can change where data is stored. This guide will publish a file path only after it has been checked on the current Windows and macOS builds.
Verification noteNo unverified registry, AppData, or library path is presented as a recovery instruction.