On game startup from Steam, a backup of all files with the naming pattern blueprint-storage*.dat is taken (supports both v1 and v2 Factorio). It maintians the last 10 timestamped backups, and the oldest is removed.
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Download FactorioBlueprintBackup-win.zip from Releases.
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Unzip the file.
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Copy the entire folder FactorioBlueprintBackup to your Factorio Steam Library location. For example the default is C:\Program Files (x86)\Steam\steamapps\common\Factorio.
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In the Steam client, go to the Factorio Library entry.
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Select Manage (the Gear icon), and open Properties.
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Under LAUNCH OPTIONS, enter the full path to FactorioBlueprintBackupLauncher.bat in double-quotes followed by %command%.
Example:
"C:\Program Files (x86)\Steam\steamapps\common\Factorio\FactorioBlueprintBackup\FactorioBlueprintBackupLauncher.bat" %command%
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Start Factorio to verify the setup is working. A new directory should now be present in the save file location %appdata%\Factorio, named blueprint-backups.
Inside the blueprint-backups directory, you will find folders timestamped with Factorio startup times. Inside each timestamped folder will be a backup copy of the blueprint-storage.dat and/or blueprint-storage-2.dat file, taken at that time.
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On the first use, Windows may produce the following warning. Simply select Run Anyway. It should not prompt on subsequent executions.
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To upgrade the script, follow the installation procedure and accept all file overwrite prompts from Windows.
