VDP: Operation failed due to existing snapshot 问题的解决

vdp 服务器问题不断，后来不堪其扰，把上线了近两年的 vdp 删了重装。本来以为可以解决一系列在使用中的问题，但却仍然在备份中有一个 VDP: Operation failed due to existing snapshot 的问题。
在网上找了很多办法，如把有类似提示的服务器建一个快照，然后进行快照管理器中点删除所有快照等，没有解决。
后来看到一个老外的办法，貌似还挺靠谱的样子，如下：

Don’t worry, easy fix.
In the Datastores view, find the VM in the Browse Datastore.
Do a Storage Migration of the VM to another datastore.
When the Migration has completed, view the old location in Browse Datastore again. You’ll see a couple leftover files, go ahead and delete that whole old folder now.
Either:
Shutdown the VM, and turn it back on again.
VMotion it to another host.
Try your backup, it should work now.

这么一试，果然在旧文件夹里面发现有文件，如是连文件夹带文件一并删除，然后再重新 Migrate 回来，再试试 vpd 备份，应该就没问题了。