Yeah, sleep on it.
You may have saved the backup on a stick somewhere or maybe you used a mobile phone and not a PC, who knows.

We've all been in your shoes and all it takes is to "not think about it" for a day or two, then the lightbulb lights up above the head and 'What do you know, it's there!".

You most likely have that backup saved somewhere safe, so safe that even you yourself can't find it!