How to check where're the VPD backup vitrual machines location

One vcenter server , three ESXI host , Two VPD Servers reside two ESXI host. 

backup 20 virtual machines to vm_backup storage.

and my VDP server is reside on the vm_backup storage.

one issue:

I know I can backup and restore virtual machines via the vsphere client . and all backup virtual machines reside on vm_backup storage

but  I want to know how to see the backup virtual machines in datastore (VM_backup), when I browser the data store. I can only see my two VDP servers.

so how can I to do on this.

two issue :

First VDP server has a backup scheduler: backup virtual machines 01-10

Second VDP  has a backup scheduler    : backup virtual machines  11-20

I want to know ,if My first VDP server is shutdown or crash, and if  I want to restore My virtual machines 01-10.  how to do it ?

                         if My first VDP server is shutdown or crash, and I deploy to a new VDP server (Third), How can I use the third VDP server linked the backup virtual machines .

Thanks!