XenServer three types of snapshots

Three types of VM snapshots:

1. Regular snapshots: Only disk snapshots are created and can be performed on all VM types, including Linux VMs. Restore a snapshot to restart a virtual machine
2. Static snapshot: Generate a snapshot of the virtual machine disk and quiesce the VM before generating the snapshot. Windows-only virtual machines that take advantage of the Windows Volume Snapshot Service (VSS) to generate and application-consistent real-time snapshots. The VSS framework helps a VSS-aware application, such as Microsoft Exchange or Microsoft SQL Server, to flush data to disk and prepare for the snapshot before the snapshot is generated. XenServer supports static snapshots on Windows Server 2003 and Windows Server 2008 (various versions of 32-bit and 64-bit). Windows 2000, Windows XP, Windows Vista, and Windows 7 are not supported
3. A snapshot containing memory data: A snapshot containing memory data, in addition to saving virtual machine memory (storage) and metadata, also holds the virtual machine State (RAM). This type of snapshot is useful when you are upgrading or patching software, or want to test a new application, but you also want to be able to choose to return to the current, pre-change state (RAM) of the virtual machine. Restoring to a snapshot containing memory data does not require a reboot of the VM. Restore a snapshot to restart a virtual machine

Note: The color of the disk snapshot and the memory snapshot is different, so you can distinguish between the two

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