Quote:
Originally Posted by O.K-ing
Unfortunately no 
So officially no way to solve the problem? |
Calibre doesn't store anything online or upload anything anywhere on its own. The user must take these steps (for example, store a backup copy of the library in Dropbox or another cloud storage). All the books in your father's Calibre library were probably on that reformatted drive. If he had no backup copies, then yes, they're gone.