Trying to clear up icloud storage

Deleting an iCloud Backup of one device will not delete data from any other device. Go to Settings > [username] > iCloud > iCloud Backup > and select the name of the device for which you want to delete the backup.

gabiwabibabi Said:

"Trying to clear up iCloud storage: [...]My question is, my old phone is taking 68GB of storage. If I delete the backup from that phone, will it delete everything I have on my current phone that I had with the old one? For instance, photos I took with my old phone, If that makes sense.

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Safely Clearing iCloud Storage:

If not locally installed on your device, but rather on your iCloud drive, then they would be deleted from iCloud Drive. But, if all is locally stored, then, no, nothing would be lost.

Download All of iCloud:

Save a Few: If you wanted to, rather than upgrading your iCloud plan, you could export all of iCloud onto an external disk, trash iCloud storage, and then start iCloud anew.  Read my User Tip for more: Getting a Quick and Direct "iCloud Drive-to-External Hard Drive" Download - User Tip