The save files that are generated when you click "Save Game" in the "Saves" tab?
I attached an addon to my post with a function that can load these files on a dedicated server.
Instructions:
1. Add the addon to your server by extracting the archive in your server’s
addons/ directory.
2. Upload saves (with .gms file extension) to the
data/ directory of your dedicated server. (You can find save files in the
saves/ directory of your local Garry's Mod installation.)
3. (Re)start your server.
4. Run the following command from your server console:
lua_run LoadSaveFile("awesome_save.gms")
Technical information for developersSave files are binary files with the following data structure:
1. File signature "GMS3" (
0x47 0x4D 0x53 0x33).
2. Map name as a null-terminated string.
3. Duplication info in JSON, compressed with LZMA.
Entities can be restored by passing the duplication info to
duplicator.Paste.
JavaScript-based web app that shows duplication data:
https://timmy.ws/demos/gms-parser/index.htmlSmall save file for testing purposes:
https://timmy.ws/demos/gms-parser/sample.gms
2016-10-15 Update: Added information about the Garry's Mod save file data structure.
2017-01-07 Update: Attached a refactored and optimized version of the addon.