How would ZFS snapshots help in a situation like this, where you have accidentally formatted your drive?

Unless you require the dynamic features of Wordpress, you could have a look at some of the static site generators out there (such as Hugo). Having a static site would reduce the attack surface considerably. Also due to the shenanigans happening with Wordpress at the moment, I would be weary of using it.

About SSL, what others have already mentioned, SSL certs are available for free these days, thanks to letsencrypt.

Why? Even 1080p is more than what is usually needed for such a KVM solution. It is not like this is meant for doing remote work on a computer or anything like that.