David wants to know why iCloud won't backup more than one iPhoto library. Leo says that iPhoto morphed into Apple Photos and will only backup the main library by design. What he recommends is to merge the libraries together by importing. Press the option key and hold on the library you want to open. Then go into file, and then import. From inside the apple photos folder, there's a data folder. R/C and select show package contents. That will open the original folder. Then, drag them into your master Photos folder. Here's a technote about it.