I think it's a waste of time. It doesn't really add anything. If you don't want to lose your subscription in the unlikely event that your server/instance goes down forever, just use the export feature to make occasional backups. You can always create a new account after something happened. No need to invest that time otherwise.

You're free to use sockpuppets though. Or if you're moderating stuff or participate in instances/communities who don't federate.