HD3 may create a minimum of 2 permanent files, and a number of optional files. All these files end up in the same folder.

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Windows : the general location is C:\Users\[your username]\NULLLsaves\HD3

Mac

Linux

Android : the files will end up in a location that generally can't be accessed unless your device is rooted. Uninstalling the game will also cause all these files to be deleted.

Stores all the settings of the game. Check the HD3 game settings article for more info

Contains your progress and your in-game items.

Created when you download data from the server through the savegame sync feature. This is a backup of your savegame file, in case there was an error with the downloaded data.

Created whenever the game detects that the version number of the savegame is smaller than the version number of the game. The 'xxxxxx' part of the filename refers to the current version of the game at which time this file was created.
This file is a copy of your savegame. It gets created on the first launch after having installed a new version of the game. This is a safety measure, incase a new version of the game introduces a bug that affects the savegame.

Created while the game is running. These logs will store general information about the progress of the game, such as combat logs. Creation of these files can be turned off through changing a setting in the settings file. These files can safely deleted.

Created when the game crashes (though not every crash can generate a file). These files contain info that might help tracking down and fixing the cause of the crash. These files should be emailed to nulllgames@gmail.com
Creation of these files can be turned off through changing a setting in the settings file. These files can safely deleted.