I loaded 5 tonnes of sand into my 4runner and now it's ruined, Toyota claims a 4Runner is not a 5 tonne truck won't give me my money back or honor the warranty, I swear the mechanics were laughing at me.
However, I'm not sure how many of their clients have single drives with 17TB of data. Perhaps this is an edge case that they didn't adequately test for.
And since a vast majority of their customers will not have more than 3TB on any single drive, I can see why this might not be well tested.
Not sure what happened in this particular case as I'm not familiar with it, but I'd venture to guess that something occurred on the computer that caused the client to think it needed to re-upload those 13TB of data, so it scheduled them for re-upload.