21 hours sounds pretty long to me. What type of data was it and how long would you have waited until you continued with a backup of the data on a different machine?
We were definitely prepared to recover from a backup, but the support team told us: "the issue with the file system will likely persevere over a backup/restore". So this, in combination with the data loss you have when recovering from a backup, means we basically had no choice other than to wait till the issue was resolved.
