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Data deduplication ratios are related to the number of changes occurring to the data. Each percentage increase in data change drops the ratio; the commonly cited 20:1 ratio is based on average data change rates of approximately 5%.
Vendors assume that compression will reduce deduplicated data by a factor of 2:1. If the deduplication ratio were 15:1, for example, compression could increase that ratio to 30:1. But users with large amounts of data stored in compressed formats, such as jpeg, mpeg or zip, aren't likely to realize the extra bump compression provides.
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he length of time data is retained will affect reduction rates. To achieve a ratio of 10:1 or 30:1, you may need to retain and deduplicate a single data set over a 20-week period. If you don't have the capacity to store the data for that long, the data-reduction rate will be lower.
Lastly, full backups give deduplication software a more granular view into the backup, so more frequent full backups will achieve higher ratios.
--Jerome M. Wendt
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