• Put Nextcloud into maintenance mode: (in config.php file)

<?php
 
 "maintenance" => true,

• Using rsync, restore the folder and its contents e.g.

rsync -Aax /whereyourbackupis/nextcloud-dirbkp_20201010 /whereyourwebdirectoryis/nextcloud-data/

• Restore the database using PHPmyadmin, how to import can be found here