How to upload processeed images from lightroom classic to Creative cloud for cloud backup

You can accomplish what you're looking for either on the front end or the back end of your process. It depends on what makes the most sense for you. 

From the beginning of your process:

- Import your RAW files into Lightroom CC, not Lightroom Classic.

- Sync Lightroom Classic with Lightroom CC.

- In Lightroom Classic, the synced files will show up in a folder named for the hardware you used to import the files. For example, iMac, or iPhone, Pixel, or whatever you used. (Lightroom CC's cloud storage is handled in folders that are permanently tied to your device. You can't organize those storage folders like you're probably used to in Lightroom Classic.)

- You can then make your adjustments and the RAW image and the metadata will be in the cloud.

- These files do not end up in your synced Creative Cloud Files folder or on Creative Cloud Web. They are in a Lighroom-specific location that you access through Lightroom CC, the Lightroom mobile app, or the Creative Cloud mobile app.

- This is a cumbersome process because Lightroom Classic won't store the original RAW files in the cloud. It won't even let you add RAW files to the cloud folders you can see along with your local folders. It just lets you to create synced collections of metadata.

At the end of your process

- Export whatever files you want to backup--JPGs or the RAW images plus the metadata Sidecar files--to your local Creative Cloud Files folder. This will sync to the cloud.

- You won't be able to open these from Lightroom Classic or Lightroom CC. You would need to import them again.

My personal workflow is to use the first method to get all of my files in the cloud. I shoot RAW with my phone a lot and this keeps everything in one place automatically. I use Lightroom Classic for my detailed editing (and because my plugins work with it), and I use Lightroom CC on my ipad or phone when I'm traveling. 

"... I'm experimenting with selecting processed images in Lightroom, clicking export, choosing a specific folder I've created within the Creative Cloud Files folder on my iMac, and exporting. When I log into my Creative Cloud account on line the images appear. They appear to be backed up on creative cloud."

What you've done is export to a folder on your hard drive, which CC automatically stores online. You could do the same with Dropbox, for example. I'd describe them as copies of files, rather than backup. After all, if you delete the file on your hard drive, you also deleting the file online and will only see it in the online Deleted Items for a few months.

This not what the Adobe cloud system if for. you would be better served using something like Dropbox or simply backup locally to external drives.

LR Classic only uploads Smart Preview to the Adobe Cloud system, LR Web. And you will soon run of of the allotted storage space Adobe give you with your subscription.