The current save file format appears to be rather bulky. My latest save games are exceeding 25MB in size.
When I transferred my 800MB SaveGame folder to another PC, by zipping it, I noticed that the size of that zip file was a mere 40MB.
Turns out these save files can be compressed a lot. (At the cost of a bit of loading / saving time, of course)
I would like to suggest that SatisFactory compresses their save files.
Less disk space used. (Especially on laptops where disk space is still at a premium)
Easier / faster transfer of save files between devices.
For online play, the loading time might even be lower, considering you'd only have to download 5% of the data.