Revisions
Every save creates a revision of that language's content. Open History on a page to see who changed it and when, compare versions and restore an older one. Restoring creates a new revision, so nothing is ever lost.
Redirects
When a page is renamed or moved, NextDocs records a redirect from the old path to the page. Readers following an old link are sent to the new URL with a permanent (301) redirect.
Redirects are listed in Docs → Redirects, where you can delete ones you no longer need.