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 current 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 Go to command in the Snapshot Manager 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
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.
When you quiesce a virtual machine, VMware Tools quiesces the file system of the virtual machine. A quiesce operation ensures that a snapshot disk represents a consistent state of the guest file systems. If the virtual machine is powered off or VMware Tools are not available, the Quiesce parameter is disabled.
The disks are crash-consistent unless you quiesce them.
When is the best time to take snapshot?
The best time to take a snapshot from a storage perspective, is when you are not incurring a large I/O load. The best time to take a snapshot from a service perspective is when no applications in the virtual machine are communicating with other computers. The potential for problems is greatest if the virtual machine is communicating with another computer, especially in a production environment. For example, if you take a snapshot while the virtual machine is downloading a file from a server on the network, the virtual machine continues downloading the file and communicating its progress to the server. If you revert to the snapshot, communications between the virtual machine and the server are confused and the file transfer fails.