I have a 3.6 GB catalog that I am trying to back up, but it seems to be stuck. The progress bar will get to about 90% complete, stall, and then jump back to about 10% complete and repeat the process. After doing this for about 5-10 minutes, I get an error the Lightroom was unable to back up the catalog and that I need to check permissions and available space. Permissions and available space are fine. The location that I'm backing up to has over 900 GB of available space. This started after I upgraded from LR4 to LRCC last week. Could this be an issue with creating the .zip file for the .lrcat?
Thanks for your help!
The symptoms sound similar to what others have reported -- see this bug report in the official Adobe feedback forum: Lightroom: Possible problem with catalog backup zip files. Adobe says they are working on the problem. Add your vote and details to that bug report, and you'll be notified of when the problem is fixed.