[HELP] Modpack deleted - After reinstalling, can I salvage the world?

[gradeiants]

 

I have been playing the Flora & Fauna modpack for some time now. Through this, I have made a backup of my world, and then continued advancing through the game, (farms, greenhouses, achievements, etc.) Although today, I discovered that the modpack and its contents had been deleted. I reinstalled the pack, and added the backup world save I made to the saves folder. Upon logging into the world, however, I realized I had in fact not updated the world backup, and was now reset with nothing but a house. 

Is it possible to somehow update the world backup, even though I do not have the world in the first place? I have searched the recycle bin, used the "Previous versions File History tool",  installed several recovery programs, and replaced the level.dat, but still to no success. I'm hoping there was something I missed through the endless google searches, and if so please provide it here. 

Thank you for your time! -Gradeiants