I saw a question recently about how to restore your environment if a remote Proxy Controller system fails. This is a good question, and there are a few facets to the answer, depending on your environment.
If you don't have a backup of the Proxy Controller, it's going to take a bit more work. First, you have to migrate the dead PC's assets to a new PC. If you have automatic failover enabled, this happens automatically (hence the name); otherwise you can do it manually.