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Table Of Contents
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Snapshots provide a point-in-time image of the disk that backup solutions can use, but Snapshots are
not meant to be a robust method of backup and recovery. If the files containing a virtual machine are
lost, its snapshot files are also lost. Also, large numbers of snapshots are difficult to manage,
consume large amounts of disk space, and are not protected in the case of hardware failure.
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Snapshots can negatively affect the performance of a virtual machine. Performance degradation is
based on how long the snapshot or snapshot tree is in place, the depth of the tree, and how much the
virtual machine and its guest operating system have changed from the time you took the snapshot.
Also, you might see a delay in the amount of time it takes the virtual machine to power-on. Do not run
production virtual machines from snapshots on a permanent basis.
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If a virtual machine has virtual hard disks larger than 2TBs, snapshot operations can take significantly
longer to finish.
Managing Snapshots
You can review all snapshots for the active virtual machine and act on them by using the Snapshot
Manager.
After you take a snapshot, you can use the Revert to Latest Snapshot command from the virtual
machine’s right-click menu to restore that snapshot at any time. If you have a series of snapshots, you
can use the Revert to command in the Manage Snapshots dialog box to restore any parent or child
snapshot. Subsequent child snapshots that you take from the restored snapshot create a branch in the
snapshot tree. You can delete a snapshot from the tree in the Snapshot Manager.
The Manage Snapshots dialog box contains a snapshot tree, details region, command buttons, and a
You are here icon.
Snapshot tree Displays all snapshots for the virtual machine.
You are here icon Represents the current and active state of the virtual machine. The You are
here icon is always selected and visible when you open the Manage
Snapshots dialog box.
You can select the You are here state to see how much space the node is
using. Revert to and Delete are disabled for the You are here state.
Revert to, Delete, and
Delete All
Snapshot options.
Details Shows the snapshot name and description, the date you created the
snapshot, and the disk space. The Console shows the power state of the
virtual machine when a snapshot was taken.
Taking Snapshots of a Virtual Machine
You can take one or more snapshots of a virtual machine to capture the settings state, disk state, and
memory state at different specific times. When you take a snapshot, you can also quiesce the virtual
machine files and exclude the virtual machine disks from snapshots.
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