Ok so :

- I don't think I have any Backup of myDocuments or I don't know where it would be. I searched for "QuickSave_" in explorer on my whole computer but found nothing...
- I didn't know what is windows shadow copy. After google searching i found that it's a kind of backup you initiate. And I didn't do anything like that...
- I right-clicked every single folder but nerver saw a "restore previous versions" option nor in "Properties, Previous Versions tab"

I think I'm truly f***ed -_-'

If someone has an idea I'll try everything.