Deduplication is
not a new concept though the term is relatively new. It originated more from
the backup prospective though it has now got good footholds in many IT
components.
I know and have
been using for over a decade backup technologies that would backup only unique
emails and files, and subsequently backup only delta changes. Being the only
one doing that, they used their own language. They did not coin the word
deduplication. Now everyone does that and calls it File level deduplication.
This approach served good for desktop and laptop backups. Then this technology
progressed, the current being block level deduplication. This recognises unique
blocks of data and ensures that one block gets backed up only once, thereby
reducing the amount of data travelling and getting backed up.
Like any other
process, deduplication also needs resources to do what it is meant for. Various
applications offer various forms like source based, target based and inline
deduplication. Each one of them has their own working mechanisms and pros and
cons. In the following series of blogs we will discuss the various methods of
deduplication along with their pros and cons.
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