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Just wondering if crash game (alt +f4) or even though I press exit game and the client crash will save the file.
If I stop taking census in the middle of it, lets say 20min into the game, can I still upload the data and can that file still be useful?

If you crash out then the variable file will not be updated. The file is only updated when you have a clean shutdown or if you type /console reloadui

If you wish to upload your data during a play session, you need to do a /console reloadui, and then send in your data.