You obviously can't bring someone back once they're dead. It's like turning off a computer and then putting it in a freezer and saying in 5000 years they'll be

You obviously can't bring someone back once they're dead. It's like turning off a computer and then putting it in a freezer and saying in 5000 years they'll be able to come up with a way to restore it to the exact same state it was in before you turned it off. In theory you could find a way to copy the state while it is still on and then bring them back that way, but that depends on whether the system is actually a physical network that is you or whether there is a "soul" made up of the traces of old data floating around the network which you wouldn't be able to capture.