1. Responsibility to have a backup.
2. Responsibility to not screw up live data.
When someone screws up on #2, it inconveniences the person responsible for #1 and potentially loses any data since the last backup. That is the limit of #2's responsibility in this.
If #1 hasn't done his job right, it will come out when someone eventually plays the part of #2 (mistakes happen). Once that happens, the damage from not having a backup is #1's responsibility, not #2's.
In this case, we do not have clear information about who was responsible for #1.
It is my job to make sure we have a well-run software engineering product team. Ensuring that backups run and are tested is one small part of my job. Not doing the backups, sure, but making sure the team has taken care of it.
Mistakes happen and folks shouldn't be punished for that.
Remember that disks are fallible - human error needn't be involved to require recovery from backups.
Regardless of the root cause of data corruption, requiring three days to recover is completely a management/organization problem.