My cloud backup has always said I do not have enough space

Dawn Ellis 1:
All I can click on is "Upgrade" which takes me to a blank page, and "Manage backup sets".

Please allow all Norton pages content. 

https://my.norton.com/extspa/backup

Please try clearing browser cookies n' cache.
Please try allowing all Norton pages cookies/ads/scripts/frames/trackers/content.
Please try allowing all Norton pages content that may be blocked by browser extensions or built-in browser protections. 

Please try Norton Secure VPN off - before and after machine restart -
Please Restart (not Shut down) machine -

Usually, partially built page means some Norton page content is blocked thru browser built-in function &or browser extension. 
Maybe, try whitelisting ... my.norton.com ... with any ad/script/tracker ...blocker either thru browser built-in function &or browser extension. 

Maybe, your partially built page appears:  for example

and you're expecting: for example 

You can delete a backup set if it is no longer needed. You cannot delete a backup set if only one backup set is available. However, you can create a new backup set before you delete the old backup set.

When a backup set is deleted, the Backup details of the files that are included in that backup set also change. For example, the icon overlays and the Backup tab in the file properties of the file no longer appear.

Deleting a backup set is particularly helpful if you want to free some space on your Secure Cloud Storage.

• Delete a backup set 

• Delete backup set from your account 

https://support.norton.com/sp/en/us/home/current/solutions/v19828921

DELETE A FILE FROM A BACKUP SET ON THE NORTON BACKUP DRIVE

1. In Windows Explorer, click Norton Backup Drive.

2. Select the backup destination and navigate to the backup set destination that contains the file that you backed up.

3. Do one of the following:

   • Right-click to select the files to delete, and then click Delete.

   • Select the file, and then click Delete.

https://support.norton.com/sp/en/us/home/current/solutions/v19828933

Turn on Norton backup from Settings window
https://support.norton.com/sp/en/us/norton-360/current/solutions/v7821374

Get started using Norton Cloud Backup 
https://support.norton.com/sp/en/us/norton-360/current/solutions/v19213795

Delete backup set and files from Norton backup 
https://support.norton.com/sp/en/us/home/current/solutions/v19828921

Manage backup files on Norton Backup Drive 
https://support.norton.com/sp/en/us/home/current/solutions/v19828933

Modify settings for or rename your Norton Backup sets 
https://support.norton.com/sp/en/us/norton-360/current/solutions/v19828922

Add or exclude files and folders in your backup sets 
https://support.norton.com/sp/en/us/norton-360/current/solutions/v20534334

View or change the default file types or file extensions that Norton includes in backups
https://support.norton.com/sp/en/us/norton-360/current/solutions/v7344814

Restore pictures, music, or other important files from Norton backup sets 
https://support.norton.com/sp/en/us/norton-360/current/solutions/v6958542

Choose the location of the files to be restored before running Norton Backup 
https://support.norton.com/sp/en/us/norton-360/current/solutions/v7927242

Fix problems with storage space in Cloud Backup
https://support.norton.com/sp/en/us/home/current/solutions/v128450551

Norton video tutorials - Backup and Restore
https://support.norton.com/sp/en/us/home/current/solutions/v102698236