Acronis Backup for Windows Server Essentials - User Guide - Manual (Page 228)

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The following diagram illustrates the result of deduplication at target.
The indexing activity may take considerable time to complete. You can view this activity's state on
the management server, by selecting the corresponding storage node and clicking View details (p.
219). You can also manually start or stop this activity in that window.
Compacting
After one or more backups or archives have been deleted from the vault—either manually or during
cleanup—the data store may contain blocks which are no longer referred to from any archive. Such
blocks are deleted by the compacting task, which is a scheduled task performed by the storage node.
By default, the compacting task runs every Sunday night at 03:00. You can re-schedule the task by
selecting the corresponding storage node, clicking View details (p. 219), and then clicking
Compacting schedule. You can also manually start or stop the task on that tab.
Because deletion of unused blocks is resource-consuming, the compacting task performs it only
when a sufficient amount of data to delete has accumulated. The threshold is determined by the
Compacting Trigger Threshold (p. 220) configuration parameter.
7.5.7.3 When deduplication is most effective
The following are cases when deduplication produces the maximum effect:

When backing up in the full backup mode similar data from different sources. Such is the case
when you back up operating systems and applications deployed from a single source over the
network.