opt-in way to save annotated pages to internet archive

### Problem you are trying to address with this feature

Not so much a problem as an opportunity. We've long discussed, with folks at the Internet Archive, the idea that annotated pages could be saved to the archive, and that if an annotated page went 404 it could still be retrieved from there and used to anchor annotations.

### Your solution

We can proceed in phases.

Phase 1: Save to archive.

Phase 2: Retrieve otherwise lost pages from archive.

Phase 1 alone has value to the user (knowing the targets of your annotations are preserved) and to the mission (helping to make the foundation of the web's annotation layer more durable and reliable).

And Phase 1 is quite simple to do:

http://jonudell.net/h/save-to-wayback.mp4

We've talked amongst ourselves, and with IA folks, about whether this could happen by default or would require user opt-in, I favor the latter, with a setting "Save Annotated Pages to Internet Archive" that defaults to "No" -- but of course that's a discussion to have.