Q

Can I restore backup copies made from data deduplication for disaster recovery?

For disaster recovery, you can restore backup copies made from data deduplication. However, it is crucial to protect your deduplication indexes and to restore everything in the right order.

Can I restore backup copies made from data deduplication for disaster recovery?
You can rely on backup copies made from data deduplication, but it is vital to protect your dedupe indexes and to restore everything in the right order. When performing a standard restore, all data is found in a linear fashion on your tapes. When data deduplication is involved, the non-unique data is referenced by pointers and the indexing database locates the necessary data. Therefore, to ensure that all data is protected from a disaster at your primary site, the backup and deduplication databases must be recovered first. Even if you had the ability to replicate these databases, their protection is critical.

Regardless of whether your backup data is deduplicated or not, a carefully constructed backup cycle needs to be maintained. You will not necessarily need to take a full weekly backup, but retention policies need to be set so that there is always a copy from which to recover. Similarly, if your deduplicated backup images are stored remotely, all non-expired tapes must remain off-site.

Read more on Data protection, backup and archiving

How dedupe fits into your data backup plan The fourth chapter of this e-book discusses things to consider about the way deduplication is performed and the ways that dedupe integrates with other data protection processes. It offers information about how deduplication can impact restore time and the different approaches vendors take to speed restores of deduped data. It can take longer to restore deduped data than a comparable restoration might take, had the data not been deduplicated at all. The degree to which the deduplication tax becomes an issue depends on the nature of the restoration, the vendor product being used, and the method used to deduplicate the data. This chapter also takes a look at how deduplication integrates with other data protection processes such as replication, encryption/compression, cloud and archiving. For instance, some forms of replication can be problematic when used in conjunction with deduplication.

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