One of our users made a startling discovery this week after upgrading to High Sierra. He had an HFS+ formatted 16TB RAID device, and had always intended to enable encryption on that volume. There’s no OS on it, so he simply right-clicked on the volume in the Finder and chose the option to encrypt it.
This is an easy way to enable encryption on a volume: plug in a password, verify, add a hint, done!
Oddly, though, [Carbon Copy Cloner], Disk Utility, and Terminal all agreed that his HFS+ volume was now an APFS Encrypted volume. Naturally he contacted AppleCare. “Not possible, says Apple”, he reported.
Yet again, Apple support doesn’t know what they’re talking about.
If CCC reports that antivirus software may be interfering with your backup task, here are some troubleshooting steps that you can take to resolve the problem: Determine whether the files in question are being quarantined by your antivirus software. Perform a system scan with your antivirus software and address any issues that are reported. I purchased Carbon Copy Cloner, a software utility written by Bombich Software Inc., in April 2014. All went well until I upgraded my operating system recently, and found that the version of Carbon Copy Cloner I had bought is 'disabled' from running on my new operating system. View Bombich Software (www.bombich.com) location in Massachusetts, United States, revenue, industry and description. Find related and similar companies as well as employees by title and much more.
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This is particularly worrisome. If you convert a disk to the new APFS (Apple File System), it won’t be readable from a computer that is not running on an APFS volume. So if you have a problem with your computer, you may not be able to access data on that disk. Also, this means you cannot encrypt a portable hard drive on an APFS computer if you plan to use that drive with a non-APFS computer (ie, one running macOS Sierra or earlier).
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Source: Think twice before encrypting your HFS+ volumes on High Sierra | Carbon Copy Cloner | Bombich Software