Deduplication; Cumulative State And Status Of A Policy - ACRONIS Backup & Recovery 10 Advanced Server SBS Edition User Manual

2.11.5.5

Cumulative state and status of a policy

In addition to the deployment state and status as related to a specific machine or group, the backup
policy has a cumulative deployment state and a cumulative status.
The cumulative state of a backup policy
To see this parameter, select Backup policies in the tree. The Deployment state column displays the
cumulative deployment state for each policy.
This state is defined as a combination of deployment states of the policy on all machines the policy is
applied to (directly or through inheritance). If the policy is currently not applied to any machine, it
does not have a deployment state and the column shows "Not applied".
For example, you applied the policy to machine A. The policy was successfully deployed. Then you
modify the policy and immediately apply it to the group consisting of machines B and C. The policy
has to be updated on A and deployed to B and C. While the processes take place, the policy's
cumulative state may look like "Updating, Deploying", then change to "Updating, Deployed" or
"Deployed, Deploying" and will normally end up with "Deployed".
The cumulative status of a backup policy
To see this parameter, select Backup policies in the tree. The Status column displays the cumulative
status for each policy.
This status is defined as the most severe status of the policy on all machines the policy is applied to.
If the policy is not applied to any machine, its status is "OK".

2.11.6 Deduplication

This section describes deduplication, a mechanism designed to eliminate data repetition by storing
identical data in archives only once.
2.11.6.1 Overview
Deduplication is the process of minimizing storage space taken by the data by detecting data
repetition and storing the identical data only once.
For example, if a managed vault where deduplication is enabled contains two copies of the same
file—whether in the same archive or in different archives—the file is stored only once, and a link to
that file is stored instead of the second file.
Deduplication may also reduce network load: if, during a backup, a file or a disk block is found to be a
duplicate of an already stored one, its content is not transferred over the network.
Deduplication is performed on disk blocks (block-level deduplication) and on files (file-level
deduplication), for disk-level and file-level backups respectively.
In Acronis Backup & Recovery 10, deduplication consists of two steps:
Deduplication at source
Performed on a managed machine during backup. Acronis Backup & Recovery 10 Agent uses the
storage node to determine what data can be deduplicated, and does not transfer the data whose
duplicates are already present in the vault.
Deduplication at target
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