messed up file/dir owner:group

Hey everyone,
as my Nextcloud needed very much space i was in need to mount a volume with enough space to /var/www

Here is how i done it:

1. mounted the volume to /mnt/new-www via fstab (/dev/disk/by-id/scsi-0HC_Volume_1234567890 /mnt/new-www ext4 discard,nofail,defaults 0 0)
2. cp -R /var/www/* /mnt/new-www
3. umount /mnt/new-www
4. edited the fstab to change to destination to /var/www (placed it in front of the ispconfig bind mounts)
5. systemctl stop {nginx,postfix,mariadb}
6. mv /var/www /var/www.bak
7. rebooted the server

But it messed up my ownerships...everything is owned now by root:root.

Does someone can tell me what needs which permissions from /var/www beginning?

Code:

drwxr-xr-x  6 root root 4,0K Mar 14 11:01 .
drwxr-xr-x 14 root root 4,0K Mar 14 11:02 ..
lrwxrwxrwx  1 root root   30 Mar 14 11:00 domain1.de -> /var/www/clients/client1/web3/
lrwxrwxrwx  1 root root   30 Mar 14 11:00 domain2.de -> /var/www/clients/client2/web7/
drwxr-xr-x  2 root root 4,0K Mar 14 11:00 apps
lrwxrwxrwx  1 root root   31 Mar 14 11:00 domain3.de -> /var/www/clients/client1/web10/
drwxr-xr-x  2 root root 4,0K Mar 14 11:00 awffull
drwxr-xr-x  4 root root 4,0K Mar 14 11:00 clients
drwxr-xr-x  2 root root 4,0K Mar 14 11:00 html
lrwxrwxrwx  1 root root   30 Mar 14 11:00 domain4.net -> /var/www/clients/client1/web1/
lrwxrwxrwx  1 root root   31 Mar 14 11:00 domain5.net -> /var/www/clients/client1/web11/
lrwxrwxrwx  1 root root   30 Mar 14 11:00 domain6.de -> /var/www/clients/client2/web6/

Is it this?

Code:

chown -R web3:client1 /var/www/clients/client1/web3
chown -R web10:client1 /var/www/clients/client1/web10
chown -R web1:client1 /var/www/clients/client1/web1
chown -R web11:client1 /var/www/clients/client1/web11
chown -R web7:client2 /var/www/clients/client2/web7
chown -R web6:client2 /var/www/clients/client2/web6

It fixed the websites but what about the folders within /var/www/clients/client1/ (the webID folders owner:group) and what about the folders inside of the webID folder? For example "backup,cgi-bin,log,private,.ssh,ssl,tmp,web" and when there is a ssh/sftp user additional the folders "bin,dev,etc,home,lib,lib64,usr,var"?

 

After i got the sites working again, independently from the other folders, i removed it. Actually i'm setting up a similar server and will check how the permissions are set up there and fix it on my actual live server. There's no rush now, as the pages are up and running again for the time being.