According to the tape drive backup system is broken. Make the backup system is currently unavailable. If data corruption will no longer be able to recover the data back, it is necessary to buy a new tape drive replacement.
According to the tape drive system used in the backup. As now the backup does not work if the damage can not be restored. So there is no need to buy a replacement tape drive.
As tape drive used in the system backup was broken. Now system backup unavailable if the corrupted data will not be able to recover data back. Therefore, it is necessary to buy tape drive replacement.