Coming to personal preferences, I do. And that was one of the main reasons I wrote buku. And I don't store the context, just a pointer to the context. Just like you don't normally pass a full structure by value over the stack but use a pointer.

When I need the context I check the original link. If it's not there I try Google Cache or archive.org. If it's lost, I find an alternative (thanks to the title and notes fields in buku). That's more or less my workflow when in comes to the 8K odd bookmarks I have.