Hi
The concept of the VSS Writer is that it allows the files constituting the VM to be backed up, by a VSS aware backup tool on the host, even though the VM is running and without VSS awareness would not be able to be backed up due to busy files. So once you have followed the steps in the User Guide, you use your VSS aware backup tool to backup whatever VMs you want - either the whole datastore folder (and subfolders) or individual VM folders - to whatever media/files you want. Restoring is then the inverse except you need to have the VM shutdown or restore the files to a different location and then just add the restored .vmx as a new VM.
if need any more information please get back to us.
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thanks