How do you know this?

Because this explanation:

>Canon has announced the results of its investigation into the loss of image data on the image.canon cloud platform. According to Canon, when the company switched over to a new version of the image.canon software on 30 July, the code to control the short-term storage operated on both the short-term storage and the long-term storage functions, causing the loss of some images stored for more than 30 days.

seems pretty banal. Updating a service and forgetting to update the backups is not an uncommon thing, and quite a few software companies have published post mortems saying they did exactly that.