Dupplicate Nextcloud folder properly

Hello, and a big hello from Paris
I have dupplicated the folder /var/www/nextcloud to make a second site, /var/www/site2.
Il also made a second vhost in the apache folder.
Only, all the modifications that I make on the site2 are applied, too, to the first one, nevertheless they are two different folders.
Can you help please.
Thank you in advance.