I have attempted to backup LR catalog. The backup was placed on external drive. It appeared to go well. I attached external to the Mac Pro, OS system. When I go to the backup folder to establish a new catalog In Lightroom the folder hierarchy is as follows: Backups>2016-11-19>Catalog.LR.zip. But the zip file is gray and not selectable. I can do a quick look and Open is selectable. I get the following message in LR. "lightroom cannot open files in nsfilenamespboardtype format"
Any suggestions would be appreciated.
You cannot directly open a backup. This is a good thing.
You need to unzip the catalog to a writeable folder then use the catalog from there.
To make sure you copied all the needed files from the PC to the Mac, see this link: