I need to know how to access my past cloud files

Sign In to your Norton account -> Cloud Backup tile -> View Backup Sets 

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