How are my projects backed up after activating Cloud Storage?

With Cloud Storage, each culling or editing project that you upload to Imagen is automatically backed up in two different processes:

• Upload the project photos for culling or editing.
• Upload the high-resolution photos to Cloud Storage for backup.
  
  

General information about uploading projects:

• Uploading for culling or editing is prioritized and will be uploaded first.
  For example, suppose you begin uploading a project while a previous project is being uploaded to the Cloud Storage. In that case, the backup upload will pause, and the culling or editing project will start uploading immediately.

• If the Imagen app is turned off while your computer is uploading a project, the upload process resumes automatically from where it left off the next time you open Imagen.

How do I back up older projects from before Cloud Storage?

Upload backups for projects that were uploaded in the past for culling or editing:

• 1. On the Projects page, locate the project. 
  2. At the right end of the row, click the More Options (⋮) menu, and then click Cloud Photos, or click the cloud icon in the Cloud Status column.
     
     
  3. Click Upload This Project.
     
     

Important note:
All original photos must be connected to the Lightroom catalog for the backup process to begin successfully.

See the suggested article for more information on
How to Identify And Re-Connect Missing Original Photos in Lightroom Classic Catalogs.