Install SABnzbd on a Synology NAS

Connects to Usenet servers: You add your Usenet provider login info (like Newshosting or UsenetServer).
Downloads NZB files: These NZBs are like “maps” that tell SABnzbd where to find specific files on Usenet.
Handles unpacking: It automatically repairs incomplete files (using PAR2), extracts archives (RAR/ZIP), and deletes temporary data.
Integrates with automation apps: It connects with Sonarr, Radarr, and Lidarr, so they can tell SABnzbd what to download automatically when new episodes, movies, or albums are available.
Web-based interface: Once installed, you access it from any browser through your NAS’s local IP (e.g. http://192.168.1.xxx:8080).

Install SABnzbd:
- Open Synology DSM → Package Center → Community tab (you’ll need SynoCommunity enabled).
- Search for SABnzbd and click Install.
Initial Setup:
- Launch SABnzbd and go through the web setup wizard.
- Add your Usenet provider’s server, port, username, and password.
- Configure your download folders, typically:
  - /volume1/downloads/incomplete
  - /volume1/downloads/complete
Integration with Sonarr/Radarr:
- In Sonarr or Radarr → Settings → Download Clients → Add SABnzbd
- Enter the IP of your NAS (e.g., 192.168.1.xxx), SABnzbd port (default 8080), and API key (found in SABnzbd settings under General).
Automation in Action:
- Sonarr detects a new episode → sends NZB to SABnzbd → SABnzbd downloads and unpacks it → Sonarr moves it to your media folder → Plex or Jellyfin sees it and updates your library automatically.