Acronis Backup for Windows Server Essentials - User Guide - Manual (Page 41)

41 Copyright © Acronis International GmbH, 2002-2014
acrocmd backup disk --volume=DYN --loc=\\srv1\backups --credentials=netuser1,pass1
--arc=alldyn_arc
This will back up all dynamic volumes of the local machine to a network shared folder.
Recovering dynamic volumes
A dynamic volume can be recovered:

Over any type of existing volume.

To unallocated space of a disk group.

To unallocated space of a basic disk.

To a disk which has not been initialized.
Recovery over an existing volume
When a dynamic volume is recovered over an existing volume, either basic or dynamic, the
target volume’s data is overwritten with the backup content. The type of target volume (basic,
simple/spanned, striped, mirrored, RAID 0+1, RAID-5) will not change. The target volume size has
to be enough to accommodate the backup content.
Recovery to disk group unallocated space
When recovering a dynamic volume to disk group unallocated space, the software preserves the
volume's original type and size. If the disk group configuration does not allow for the original
volume type, the volume will be recovered as a simple or spanned volume. If this volume does
not fit the unallocated space, the volume will be resized by decreasing its free space.
Examples of when the disk group configuration does not allow the original type of the volume
Example 1. The group contains fewer disks than is required for the dynamic volume. Assume you
are going to recover an 80 GB RAID-5 volume that had resided on three disks, to a disk group
consisting of two disks. The total size of unallocated space is 100 GB: 40 GB on the first disk and
60 GB on the second. The RAID-5 volume will be recovered as a spanned volume across two
disks.
Example 2. Unallocated space distribution does not allow recovery of certain types of dynamic
volumes. Assume you are going to recover a 30 GB striped volume to a disk group consisting of
two disks. The total size of unallocated space is 50 GB: 10 GB on the first disk and 40 GB on the
second. The striped volume will be recovered to the second disk as simple.
Recovery to a disk that has not been initialized
In this case, the target disk will be automatically initialized to the MBR partitioning style. The
dynamic volumes will be recovered as basic ones. If the volumes cannot fit into unallocated
space, they will be proportionally resized (by decreasing their free space).
The table below demonstrates the resulting volume types depending on the backed-up source and
the recovery target.
Backup (source):
Recovered to: Dynamic volume Basic volume
Dynamic volume
Dynamic volume
Type as of the target
Dynamic volume
Type as of the target
Unallocated space (disk group)
Dynamic volume
Type as of the source
Dynamic volume
Simple