If you are trying to take a snapshot of a Windows VPS that is also a domain controller this may fail. There is a bug in the hypervisor that stops normal production snapshots from being taken of Windows servers that are also running the domain controller role.

If you require a snapshot to be taken of a server that is also a domain controller please contact support and we can switch the checkpoint time from production to standard. This will mean snapshots can take longer to work, and may be slower while they exist, but will provide the same level of protection as a production checkpoint.