Who doesn't use services like DropBox, Google Drive, OneDrive or similar? I have decided to bury the previous Owncloud solution and through Nextcloud. The server software can be downloaded here. Simply select the „Archive file“ tab at the top and press the NOT Download button. You have to download the „tar.bz2“ archive under „Details and Download Options“ and place it in the /tmp/ directory on your Raspberry Pi.
The installation instruction is quite detailed and only a few rework is required after the installation.
I installed the whole thing with PHP 8.0 and MariaDB as the database, which gave me the problems described in News February 2022.
Here are the installation steps on the Raspberry Pi that I remembered:

• All steps are run as root user, writing „sudo“ before each command is not helpful.
• The installation instructions must be read and consulted in case of problems

apt install libapache2-mod-php8.0 php8.0 php8.0-apcu php8.0-bcmath php8.0-bz2 php8.0-cli php8.0-common php8.0-curl php8.0-fpm php8.0 -gd php8.0-gmp php8.0-igbinary php8.0-imagick php8.0-intl php8.0-mbstring php8.0-memcached php8.0-msgpack php8.0-mysql php8.0-opcache php8.0 -readline php8.0-redis php8.0-smbclient php8.0-xml php8.0-zip php8.1-cli php8.1-common php8.1-opcache php8.1-readline

apt install mariadb-server mariadb-client

The prerequisites are now installed and the actual installation of Nextcloud can begin:

cd /var/www
mkdir nextcloud
chown www-data:www-data nextcloud
# Here

Nextcloud will be in a subdirectory of your Apache2 installation (for Raspberry Pi OS and Debian this is /var/www/). So Nextcloud is located in /var/www/nextcloud. To use this correctly, you need to do the following in the Apache2 configuration directory:

cd /etc/apache2/
vi sites-available/nextcloud.conf

Here I added the following content:

Alias ​​/nextcloud "/var/www/nextcloud/"

<Directory /var/www/nextcloud/>
  Require all granted
  AllowOverrideAll
  Options FollowSymLinks MultiViews

  <IfModule mod_dav.c>
    dav off
  </IfModule>
</Directory>

All installed applications are listed under sites-available, but only the applications in sites-enabled can be used. Therefore, this file must also be found in sites-enabled

cd sites-enabled
ln -s ../sites-available/nextcloud.conf
CD

This creates access to Nextcloud, which of course will only work after the installation. Nextcloud still needs some Apache2 modules that need to be switched on first.

a2enmod rewrite
a2enmod headers
a2enmod approx
a2enmod dir
a2enmod mime
a2enmod setenvif

cd /var/www
# nextcloud-23.0.2.tar.bz2 was the current version at the time of this documentation. The file name must therefore be adjusted !!
tar -xzf /tmp/nextcloud-23.0.2.tar.bz2
chown -R www-data:www-data nextcloud
# Yes, "sudo" is mandatory here, even as a root user
sudo -u www-data php /var/www/nextcloud/occ maintenance:update:htaccess

Now that everything is prepared, the Apache2 server must be restarted:

systemctl restart apache2

At http://eure.dyndns.adresse/nextcloud you can now follow the instructions of the assistant to do the follow-up work.

Have fun