Having backups is not a complete solution
I suspect that they have the backups but they need to be done as a full restore and it's probable that it took a few days to notice and now they have more data added.
So now some poor individual is trying to work out if they do a delta on the data added, restore from backup and add the deltas which would mean having to halt data import at some point. The other option is to find some similar hardware, configure it so they can do a restore, work out the deltas and import it back into the PROD system. As the Irish saying goes, when asking someone in remote Ireland how to get to Dublin, "well, you don't want to be starting from here".
Either option is a world of pain and because of this the "leaders" will be avoiding making a decision, like they do. At some point when everyone has forgotten about it they will decide that it's too much work to do (as so much time has passed not making a decision) and will sack it off, hoping that the Official (covering our mistakes) Secret Act will stop people talking about it.