Where tape is deemed insufficient,consider other alternatives such as real-time replication to augment your tape backup solution.
Replication solutions can provide for near-zero data loss and allow for immediate system and data availability for recovery and user access.There are various options in the replication arena that vary in cost and complexity.
Some of the options include host-based or hardware-based solutions with synchronous or asynchronous replication.
Host-based replication is often more cost effective and the most flexible as it can work with heterogeneous storage and can tightly integrate with your applications to provide excellent disaster recovery and high availability solutions.
Hardware-based solutions tend to be expensive and proprietary, working only with that particular vendor's storage devices,which limits flexibility now and when choosing hardware in the future.