[Dimitri]

Thanks, I managed to get the database back up and runing. At least I have a list that I can use to find all my missing pdf ! It's going to save me some time.
I don't know why I suddenly used the sync options. I remember that the first time I used the proper "backup" function ...
Well, at least that's a mistake I won't do twice 

Thanks for your quick help and for this wonderful software