I personally screw up today and disabled all tags, and set all of the comments to the same value.
A backup was then restored, but the last 45 minutes of data was lost (for checker tags only). That means edited, created and removed tags. Also the number of runs per tag was lost, but I assume no one will notice that.
This happened a few minutes before 10:00 UTC. It took 15 minutes to restore a database backup of the table.