Much of the early debate about data deduplication focused on inline deduplication
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FalconStor Software and Sepaton Inc. call their methods concurrent processing because while they move data to a disk staging area first; they don't wait for backups to finish before deduping.
Both inline and post-process methods have their advocates but experts say neither is universally better; it all depends on what type of backup environment you have.
Deduplication is often combined with replication for disaster recovery. Deduplication reduces the amount of data and lowers the bandwidth requirement to copy data offsite. EMC Data Domain, Quantum, IBM ProtecTier, FalconStor and Sepaton are among the vendors who have beefed up their replication capabilities over the past year, often increasing the number of remote sites that can fan into the data center.
Editor's Tip: Learn more about data deduplication products and disaster recovery in this article on data deduplication and IT disaster recovery strategies in this FAQ guide from W. Curtis Preston.
This was first published in March 2010