In Lightroom CC 2015.8 on PC running Windows 7 -- When I close Lightroom and choose "Backup", the "Backing Up Catalog" bar opens but does not make any progress. No error message. I wind up having to end the Lightroom task, optimize the catalog, and then the backup works. How can I get the backup to work properly when closing Lightroom?
What is the location your are trying to write the backup to?
I'm backing up to the C: drive into the MyPictures/Lightroom/Photos/Backup folder.
Have you tried backing it up to a different location?
I just tried backing up to a different location and I still have the same problem.