I found out I had imported part of this site into a non visible wordpress.com site some time ago. There the pages that I had lost when I migrated the site once again last year, still intact but not very updated. I’ve imported them here and am happy again.
Oh, yes, the site is protected by Vaultpress and Vaultpress should be able to do a migration seamlessly. That didn’t happen with the last migration unfortubately.