Error message seen on my archives page.
I've since increased my storage to 100GB (from the free 15GB) and am trying again.
Sorry, but we weren't able to fetch all of the data that you requested. Products with incomplete data are indicated below. Also, your archive contains a list of the missing files. Please try to create your archive again. We were unable to move one or more of your archives to Drive. We either experienced an unexpected error or you do not have sufficient storage quota to store the archive in Drive.