I upgraded my LR 5 to LR CC 2015. I realized that the LR Catalog backup file (that builds up during exit process) had shrunk from 2,8 GB (LR 5) to 270 MB, probably due to compression. Can I be confident that the shrunk backup file contains everything it should?
Lightroom CC 2015 zips the catalog backup file, so it should be a lot smaller. So based on what you have said, I don't see any evidence that something has gone wrong.