For different platforms where players are downloading the game, the Subnautica save file location can vary.
This article fromMiniToolwill clarify the location for Windows, Steam, Epic Games Launcher, and macOS.
Besides, we will introduce how to back up the save data for security.
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Now, we will guide you to find these Subnautica save files.
C:\Users\h\AppData\LocalLow\Unknown Worlds\Subnautica\Subnautica\SavedGames\options\options.bin
Then you will be prompted to the designated location for Subnautica save game data.
For Mac users, the installations of Subnautica on Epic Games place their game saves in another folder.

How to protect your game progress?
This post will help you address the issues.
How to Back up Subnautica Save Files?
We recommend you useMiniTool ShadowMaker Free, which is a comprehensive all-in-one backup software.
This utility canback up files, folders, partitions, disks, and your system.
Schedule controls allows automatic backups based on the set time point.
Step 3: ClickBack Up Nowto start the task immediately when everything has been settled.
Bottom Line
Where to find the Subnautica save file location?
And we highly recommend you back up the files in case the gaming progress is lost.