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Q: Where and when should we use data dedupe for remote-office backups?
A: Data deduplication serves a dual purpose: It reduces the amount of physical storage used for backup data and is a way to replace tape for backups. The decision point is when to use disk as a backup target. Once the need to use disk has been established, dedupe increases the efficiency of disk utilization.
A common application for deduplication is in remote offices where tape handling needs to be eliminated because there are no IT skills available. Dedupe th...
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en increases the utilization of the more expensive disk storage. Dedupe solutions also reduce the bandwidth requirements for replicating data to a remote location.
Other drivers to use disk-based backups include reliability of RAID-based disk storage and the security of not having tapes leave your environment with sensitive data.
However, imaging-type data or data encrypted at the source don't benefit much from dedupe. This makes disk-based backups a pricier proposition.
--Pierre Dorion, data center practice director, Long View Systems Inc
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