I’ve done a backup swap with friends a couple times. Security wasn’t much of a worry since we connected to each other’s boxes over ssh or wireguard or similar and used tools that allowed encryption. The biggest challenge for us was that in my selfhosting friend group we all prefer different protocols so we had to figure out what each of us wanted to use to connect and access filesystems and set that up. The second challenge was ensuring uptime and that the remote access we set up for each other stayed up - and that’s what killed the project as we all eventually stopped maintaining the remote access and nobody seemed to care - so if I were to do it again I would make sure all participants have alerts monitoring their shared endpoint.
They seem to just keep getting better and better. When I scratched the lens on my index due to my own carelessness they replaced the headset for free. It’s been 5 years since I bought it and the controller strap broke last week and they sent me a free replacement. Any other company and I would have expected my only option to be buying a new controller.