The current information for Restore can be found here from now on: https://doku.dasi.nrw/mediawiki/index.php?title=Restore. 

The manual for using passkeys for restore can be found here:  https://doku.dasi.nrw/mediawiki/index.php?title=Konfiguration#Passkey_f%C3%BCr_Restore. 

Please note that the documentation links are available only in German language.