A review of some of the basic backup strategies that different Mac users rely on, looking at the pros and cons.
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If you rely on iCloud Backup ONLY, your self-created or imported audiobooks are NOT protected. Also any music files not purchased from iTunes Store are not backed up. I found this out the hard way. So now I use Desktop & Docs, Time Machine, Carbon Copy Cloner to two separate external disks. It's become almost unnecessary to clone. All I want it all my data.
John: What do you mean, exactly? How are you saving these "self-created or imported audiobooks?" Also music files? If these are saved as files, then they would be the same as other files. But are you talking about inside the libraries for the Books and/or Music apps? Those would NOT be part of iCloud Drive. Only things INSIDE iCloud Drive are part of iCloud Drive.