Looking for a program

I will go with a batch file.

Start it off with x-copy command:

xcopy [temp appdata dir] [backup dir] /e /y
Run the game (just put in the path of the .exe file)
xcopy [backup dir] [temp appdata dir] /e /y

Here's a sample (you can just type it up in notepad and save as a .BAT)

xcopy "C:\Ngamebak" "C:\Documents and Settings\Audio Phile\Application Data\N Game Save Files" /e /y
C:\Games\N-Game\N.exe
xcopy "C:\Documents and Settings\Audio Phile\Application Data\N Game Save Files" "C:\Ngamebak" /e /y

/e specifies that Windows will copy empty directories - if there are no subdirectories then this is unnecessary. In this case MOVE might also be a viable command (MOVE /Y [source\*.*] [destination]).

/y suppresses the prompt asking you if you want to overwrite the file. You should probably leave it in.

When you're done with your editing, you can run that instead of running the game executable directly.

How ya doing, buddy?

For the randomly generated save directory, I got nothing. You will unfortunately have to do it manually, I suppose. Are you SURE you can't change the save directory into something more permanent?

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As for your cake icing, you can't suppress it, but you can have it automatically minimize to the background when you run the batch file.

Silent .bat/.cmd file (no window)

There's nowhere I can't reach.