Windows Server 2008 R2 host with Parallels Virtuozzo Containers installed does not receive any new Windows updates.
The latest installed MS updates were released in 2013.
Windows Server 2008 R2 Standart/Enterprise/Datacenter without Service Pack 1 has reached its End of Support phase on 09/04/2013.
120012 Windows updates are not detected: Windows Service Pack reached End-Of-Life
Currently, installation of SP1 is not supported.
Thus only manual migration of data is possible - it means you have to create new container on destination node and migrate data by means of the installed software (e.g. Export\Import) or, if possible, by simply copying data.
10051 Does Parallels Containers 4.6 support Windows Server 2008 R2 Service Pack 1?
11154 Containers do not start after installation of Service Pack 1 for Windows Server 2008 R2 on the node.
111412 Container does not start after migration between Windows Server 2008 R2 servers with and without Service Pack 1