Here's a guide to how you can install sabnzb against the cloud.
You can, for example, add and remove downloads via browser and manage / move / delete your downloads via your Nextcloud instance.

Install python and other dep's:

sudo Zypper in -y phyton-pip
sudo pip install cheetah
sudo pip install cryptography
sudo pip install sabyenc
sudo zypper in par2cmdline
sudo zypper in unrar unzip

Download sabnzb to your server
Go to opt typ via your terminal: cd /opt
Typ now : sudo wget
Sabnzbd has now been downloaded.
Now Sabnzb to unpack: sudo tar xfvz SABnzbd-2.3.4-src.tar.gz
Now we can also delete the tar file that we no longer need: sudo rm -r SABnzbd-2.3.4-src.tar.gz
open the sabnzbd folder : cd SABnzbd-2.3.4

We have to start sabnzbd manually once typ: ./
you see a console of sabnzb here we do not have to do anything close it off by typing: q

Now that we are more ready here, we will create a folder nzb within the home folder.

cd /home
sudo mkdir sabnzb

Now copy all sabnzb files from your own home folder to the home of sabnzb

cd ~
sudo cp -R .sabnzbd/ /home/sabnzbd/

Just put the last rights right

cd /home
sudo chown -R wwwrun:www sabnzb

Now we have to adjust something in the config of sabnzbd so that you can access it from another computer

typ: ip addr

Find your IP address there if you've wired the computer, you'll see about this:

2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000 
   link/ether 74:d4:35:88:14:7f brd ff:ff:ff:ff:ff:ff 
   inet brd scope global eth0 
      valid_lft forever preferred_lft forever

In this case, our local / internal IP note this address just for yourself or remember it.

Go to: cd /home/sabnzb/.sabnzbd
typ now: sudo vi sabnzbd.ini
Now find the line that starts with host =
Fill in your local ip in this case so:
host =

Now press ESC and then: wq and then enter to save and exit the file

Now we have to make a systemd file so that sabnzbd can starts automatically

Go to: cd /usr/lib/systemd/system
Typ now vi sabnzbd.service
And paste the text / code below:
Description=SABnzbd binary newsreader
ExecStart=/opt/SABnzbd-2.3.4/ -f /home/sabnzb/.sabnzbd/sabnzbd.ini –logging 1 –browser 0 
now press ESC and then: wq and then enter to save and close the file.
Now everything is well set only just start and turn on.
Run the following commands:
sudo systemctl enable sabnzbd.service
sudo systemctl start sabnzbd.service
sudo systemctl status sabnzbd.service
This last command looks at the status of the sabnzbd when you see the text running then you have followed all the steps correctly
Now you must be able to reach sabnzbd by going to your local ip address with port 8080 behind it eg
And then you come to your sabnzbd installation.
Walk through all settings like your download location and enter your news server.

Much fun with your Sabnzbd where you can manage the downloads in nextcloud!

I make the manuals for the hobby and to help others.
You do not have to follow my manuals and are therefore at your own risk and I am not responsible for what you do on your machine!