Welcome to the forum.
Good luck, and let us know a bit more, please.
Let us start with some basic information and build from there.
What computer operating system is your Premiere Elements 12 running on?
Are you trying to do a Full Backup or an Incremental Backup?
What is your destination drive and what type of disc are you using?
Looking forward to further details.
Add On...As a reference point, please check out the Elements Organizer 12 Help PDF, page 75 (number on page)