Acronis Backup for Windows Server Essentials - User Guide - Manual (Page 100)

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2. Select whether to delete the backups or to move them to another location if the specified
conditions are met.
You will be able to specify the location where to move the backups and set up retention rules for
that location after you click OK.
Deleting the last backup in the archive
The retention rules are effective if the archive contains more than one backup. This means that the
last backup in the archive will be kept, even if a retention rule violation is detected. Please do not try
to delete the only backup you have by applying the retention rules before backup. This will not work.
Use the alternative setting Clean up archive > When there is insufficient space while backing up (p.
68) if you accept the risk of losing the last backup.
Deleting or moving backups with dependencies
To access this setting, click Show advanced settings in the Retention Rules window.
Retention rules presume deleting or moving some backups while retaining the others. What if the
archive contains incremental and differential backups that depend on each other and on the full
backups they are based on? You cannot, say, delete an outdated full backup and keep its incremental
“children”.
When deletion or movement of a backup affects other backups, one of the following rules is applied:

Retain the backup until all dependent backups become subject to deletion (movement)
The outdated backup (marked with the icon) will be kept until all backups that depend on it
also become outdated. Then, all the chain will be deleted at once during the regular cleanup. If
you chose moving outdated backups to the next location, the backup will be copied there
without delay. Only its deletion from the current location is postponed.
This mode helps to avoid the potentially time-consuming consolidation but requires extra space
for storing backups whose deletion is postponed. The archive size and/or the backup age or
number can exceed the values you specify.
This mode is not available for Acronis Cloud Storage when you copy or move backups there. In
the cloud storage, all backups are incremental except the first backup of an archive which is
always full. This chain cannot be entirely deleted because the most recent backup must always
be kept.

Consolidate these backups
The software will consolidate the backup that is subject to deletion or movement, with the next
dependent backup. For example, the retention rules require to delete a full backup but to retain
the next incremental one. The backups will be combined into a single full backup which will be
dated with the incremental backup date. When an incremental or differential backup from the
middle of the chain is deleted, the resulting backup type will be incremental.
This mode ensures that after each cleanup the archive size and the age or number of backups are
within the bounds you specify. The consolidation, however, may take a lot of time and system
resources. You still need some extra space in the vault for temporary files created during
consolidation.
This mode is not available if you selected the Archive size greater than rule for any archive
location except for Acronis Cloud Storage.
What you need to know about consolidation
Please be aware that consolidation is just a method of deletion but not an alternative to deletion.
The resulting backup will not contain data that was present in the deleted backup and was
absent from the retained incremental or differential backup.