Use of Single Instance Store (SIS) in DPM 2012 R2

Question

Hi,
Please help me to understand use of installing Single Instance Store (SIS) feature while installation of DPM 2012 R2 or reason
behind installing it.

Answer 1

DPM is using Single Instance Storage (SIS) for optimizing storage space.
Single-instance store, or SIS, is an architecture designed to maintain duplicate files with a minimum of disk, cache, and backup media overhead.
Single-instance store backup, or SIS backup, is  an API that  backup applications call to access the SIS architecture.
http://msdn.microsoft.com/en-us/library/windows/desktop/aa362538(v=vs.85).aspx
 Single Instance Store (SIS) service to reduce the storage overhead of storing duplicate files.
Single Instance Store
Before you install DPM on your server, it is important to install a technology called Single Instance Store (SIS). SIS will ensure you get the maximum performance out of your disk space and reduce bandwidth needs on DPM.
SIS is a technology that keeps the overhead of handling duplicate files low. This is often referred to as
de-duplication. SIS is used to eliminate data duplication by storing only one copy of files on backup storage media. SIS is used in storage, mail, and backup solutions such as DPM. SIS helps to lower the costs of bandwidth when copying data
across a network as well as needed storage space.
Microsoft has used a single installation store in Exchange since version 4.0. SIS searches a hard disk and identifies duplicate files. SIS then saves only one copy of the files to a central location such as a DPM storage pool. SIS will then replace other
copies of the files with pointers that direct you to the copy of the files the SIS repository already has stored.
http://www.buchatech.com/2011/06/installing-data-protection-manager-2010-2/
Have a nice day !!!