Yev from Backblaze here -> we have customer for Backblaze Online Backup with over 40TB of data, and customers with 100s of TBs if not Petabytes on B2 Cloud Storage, so we can certainly handle it.

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.

BB handles many PBs of data. Actually I think it's ZBs.

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.