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I have virtual machine on PC1. I need to copy it to PC2. That is not a problem. But then I need to make some changes to virtual machine on PC1 and then copy it to PC2. But not overwrite - I need to have both versions in separate virtual machines. What is the best way to do that?

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You could always clone a virtual machine before overwriting/changing it. – André Stannek Jan 25 '13 at 11:51
Are the changes on the VM on PC1 files or are the changes programs or applications installed on that VM – Dave M Jan 25 '13 at 13:40
In future I will need to change both virtual machines in different way. That is why I need both versions. Actually I need two virtual machines. Sometimes I will need to start both of them. – vico Jan 25 '13 at 17:56

Basically what you require is replication, this is not specifically related to the fact that you are using virtual machines.

Depending on what you want to replicate, there are different solutions for that available. You have to think along the lines of file replication or database replication. Usually that requires a domain server or replication server that monitors for changes on the one server and replicates them to the other.

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