A data storage system, according to certain aspects, automatically backs up source data when the replication data is faulty. For instance, the system performs data backup using replication data rather than source data to reduce the processing load on the source system. The backup data is then associated with the source data as if the backup had been performed on the source data. If the replication system fails, then backing up replication data results in backup data that does not accurately reflect the source data. When permitted by the user system configuration, the system automatically backs up source data when replication has failed.