You can use the Snapshot parameter of Get-VM to take a snapshot of virtual machines and then revert the virtual machines' states back to the snapshot.

Note

A snapshot captures the memory, disk, and settings state of a virtual machine at a particular moment. When you revert to a snapshot, you return all these items to the state they were in at the time you took that snapshot.

Connect to a vSphere server.

1

Take a snapshot of all virtual machines in the MyRP01 resource pool.

Get-ResourcePool MyRP01 | Get-VM | New-Snapshot -Name InitialSnapshot

The Location parameter takes arguments of the VIContainer type, on which Cluster, Datacenter, Folder, ResourcePool, and VMHost object types are based. Therefore, the Location parameter can use arguments of all these types.

2

Revert all virtual machines in the MyRP01 resource pool to the InitialSnapshot snapshot.

$VMs = Get-ResourcePool MyRP01 | Get-VM
foreach( $vm in $VMs ) { Set-VM -VM $vm -Snapshot –Snapshot InitialSnapshot }