If kept ever winds down

Kept pages are meant to outlast us. If kept ever has to shut down, we will not switch the lights off without warning: we announce the sunset well ahead of it, keep every kept page serving through that window, and publish an export so you can take your pages and their links elsewhere.

This is the short version. The full promise — the notice period, the export format, and who is accountable for it — is published alongside the open books.