I want to make sure I have access to certain web pages (as they appear today) even if they go down or change over time. What do I need to do to make this happen? Do I need to select "snapshot" every time I bookmark something? Does it do that automatically? I'd love some assistance! Thanks!

I want to keep using diigo but still maintain a copy of all my bookmarks in delicious. I just figured out how to do this from now on, but I am wondering how to get a copy of all the bookmarks I've already made copied over to delicious. I don't think I want to export them, do I? I want to keep them in diigo but just "make a copy" of them over at delicious. Thanks!