While I greatly appreciate that it saves it locally, which I consider essential, but saving it to wayback machine serves a different purpose: In case of a dispute with another party, you can resolve the claim about the state of a particular webpage using the wayback machine.
if you're concerned about legal proof, then again, relying on a third party service with questionable financials is a terrible idea.
This is plaintext markdown files. You can easily integrate git with it which will provide a timestamp and cryptographic proof that the contents are unchanged.
