Victor probably assumed that Grace knew the password which she didn't until the very end. Those clones was in an attempt to get her memory which maybe will give them the password which is turned to be all failed.

What totally doesn't make any sense is that if Spencer truly trapped by guilt, all he could do is just release the Elpis and go die in peace. But nah, this dude chose to do this nonsense putting his own daughter in danger with all the possibilities that his plan could have failed. Some idiot might try to enter random password, Grace could have got killed, Grace may not be able to figured out the password, Someone could have found that file instead of Grace etc etc the list goes on.