Download your website, engrave it on a quartz crystal[0], and hope your progeny have something to read the data from. If you want something that will last ~30 years, then tape and tape drives are a good way to go.

When it comes to web hosting, archive.org maybe? Who knows if they'll exist in 500 years. But in terms of publically accessible webpages from generations past, they seem reliable to me.

[0] https://gizmodo.com/optical-data-storage-squeezes-360tb-on-t...