From
https://cloud.google.com/blog/products/infrastructure/detail...> This incident did not impact:
> Any other Google Cloud service.
> Any other customer using GCVE or any other Google Cloud service.
> The customer’s other GCVE Private Clouds, Google Account, Orgs, Folders, or Projects.
> The customer’s data backups stored in Google Cloud Storage (GCS) in the same region.
...
> Data backups that were stored in Google Cloud Storage in the same region were not impacted by the deletion, and ... were instrumental in aiding the rapid restoration.
Emphasis mine.
You're quoting, as far as I can tell, an ArsTechnica article that makes unsourced claims about backups being deleted, neither UniSuper's nor Google's previous statements ever mentioned anything about backups being deleted.