ACRONIS Backup & Recovery 11 Guide de l'utilisateur Page 94

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94 Copyright © Acronis, Inc., 2000-2011
Storage space
Disks of the resulting virtual machine will use as much storage space as the original data occupies.
Assuming that the original disk size is 100 GB and the disk stores 10 GB of data, the corresponding
virtual disk will occupy about 10 GB. VMware calls this format "thin provisioning", Microsoft uses the
"dynamically expanding disk" term.
Since the space is not pre-allocated, the physical storage is expected to have sufficient free space for
the virtual disks to increase in size.
4.6.3 How regular conversion to VM works
The way the repeated conversions work depends on where you choose to create the virtual machine.
If you choose to save the virtual machine as a set of files: each conversion re-creates the virtual
machine from scratch.
If you choose to create the virtual machine on a virtualization server: when converting an
incremental or differential backup, the software updates the existing virtual machine instead of
re-creating it. Such conversion is normally faster. It saves network traffic and CPU resource of the
host that performs the conversion. If updating the virtual machine is not possible, the software
re-creates it from scratch.
The following is a detailed description of both cases.
If you choose to save the virtual machine as a set of files
As a result of the first conversion, a new virtual machine will be created. Every subsequent
conversion will re-create this machine from scratch. First, a new (temporary) virtual machine is
created. If this operation succeeds, the old machine is replaced. If an error occurs during creation of
the temporary machine, the temporary machine is deleted. This way, the conversion always ends up
with a single machine. However, extra storage space is required during conversion to store the
temporary machine.
If you choose to create the virtual machine on a virtualization server
The first conversion creates a new virtual machine. Any subsequent conversion works as follows:
If there has been a full backup since the last conversion, the virtual machine is re-created from
scratch. This involves creating a temporary virtual machine, as described earlier in this section.
Otherwise, the existing virtual machine is updated to reflect changes since the last conversion. If
updating is not possible (for example, if you deleted the intermediate snapshots, see below), the
virtual machine is re-created from scratch.
Intermediate snapshots
To be able to update the virtual machine, the software stores a few intermediate snapshots of it.
They are named Backup… and Replica… and should be kept. Unneeded snapshots are deleted
automatically.
The latest Replica… snapshot corresponds to the result of the latest conversion. You can go to this
snapshot if you want to return the machine to that state; for example, if you worked with the
machine and now want to discard the changes made to it.
Other snapshots are for internal use by the software.
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