User blog comment:Henzukaya/Terraria and Blackouts/@comment-14588660-20131231165019/@comment-14588660-20140106192922

You're probably missing this part here:

If not already done, you'll need to go to Controll panel>folder options>view and uncheck the option: hide extensions for known file types, otherwise you'll run into trouble when you try to rename the file.

If you don't unhide extensions, then the file will remain a txt file no matter what you try to name it. You have to rename it and change the extension to .bat, which is a batch file that executes the command line you put in the file. You can't do this directly with extensions hidden, which is the default windows setting.

If the exension is correct, then you may be running into a problem with robocopy not being installed. Best way to test for this is put this on the last line of the file:

pause

That will make the script leave the command window open so you can see any errors.

I'll try to remember to record the process of making this backup batch file. Might help if the steps are layed out visually.