Save File Location
From the Dyson Sphere Program Wiki
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Save File Locations
The location of the save game files may be found in the location below, based upon your platform.
Windows PC
%USERPROFILE%\Documents\Dyson Sphere Program\Save
Linux (Steam Play)
<Steam-folder>/steamapps/compatdata/1366540/pfx/
References
1. Dyson Sphere Program Save File Location On PC & Steam - Guide