I used a Bash script for a long time that would take my new bookmarks each month and download a copy of the page. It came from an idea presented on HN, I would ack-grep it for search.

Stores using it because I use several computers and two OS now, and the utility of it is pretty low for me.

You could make a donation to Archive.org and just a script to check for an "archive-this" tag in your bookmarks, then pass those pages to archive.org??