While it's far from an ideal solution, you can throw your bookmarks periodically to archive.org's "Save Page Now!" service. It's easy to semi-automate it - here's how I use it with pinboard.in bookmark exports: https://pastebin.com/uUVE22RD
But if we're looking for a developer side solution, then making pages that last an order of magnitude longer may be better for everyone in the long run, e.g. https://jeffhuang.com/designed_to_last/