Yev from Backblaze here - as far as the technical aspects, it's tough for me to say b/c I don't know what happened in this case, but we do have use-cases where

Yev from Backblaze here - as far as the technical aspects, it's tough for me to say b/c I don't know what happened in this case, but we do have use-cases where we need to "Freeze" backups (more info: https://help.backblaze.com/hc/en-us/articles/217666178-Safety-Freeze-Your-Backup-is-Safety-Frozen- https://help.backblaze.com/hc/en-us/articles/217666178-Safet...). I would venture to guess that since this occurred on their C: drive, something similar to that happened here, and they needed to re-upload the data (in most cases, previously uploaded data is still available for restore - but with 13TB of data to re-upload and not a lot of bandwidth, it would have taken them way longer than our 30-day history to do that).