See my video below which outlines a high level overview of the backup process and how the variable segment length, source and global deduplication works in an EMC Avamar solution.

Here are the different / common types of data deduplication found in the marketplace today.

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EMC Avamar uses variable block length deduplication, compression, and hashing to achieve the incredibly high levels of efficiency we see customers happily enjoying every day.

One thing I forgot to mention in the video is when the process gets to the point where it checks to see if the hash of the data exists on the Avamar server (step 6), this is the "global" part of the global deduplication magic that is EMC Avamar.

http://www.youtube.com/watch?v=EbqW_016nVM

For the record, my Macbook Air keeps autocorrecting "deduplication" into "reduplication" in case you see that in any of these posts.