To make a long story short : I erased 2500 items this afternoon... Yup, I made a mistake. And discovered, much too late, that I had no "recent" backup -- I did move my backup folder at some point (not sure why I did that, but I did...) and IQ didn't create a new one to replace it...
Fortunately, yes, I had a 1.5 days old backup from my external HD -- ironically I usually backup twice a day, but not this time... :(.
Close enough, but it took me almost 6 hours to put back the older DB close to how it was just before the disaster. :)
In any case, I wonder if IQ could :
1- create the backup folder (if it doesn't exist)
2- and warn the user if it can't backup for some (other) reason.
That would really help avoiding embarrassing situations...
Voilà.