SABnzbd on a Seedbox: Usenet Downloader Setup

What SABnzbd Is

SABnzbd is a Usenet binary downloader. You feed it NZB files (the Usenet equivalent of a torrent file), and it pulls the binary parts down from your Usenet provider, repairs any missing chunks with PAR2, unpacks the archive, and hands you the finished file.

It's been around since 2005, runs on a clean web UI, and integrates with every *arr app out there. If you're using Usenet at all on a seedbox, SABnzbd is one of two clients you'd pick. The other is NZBGet.

Why Run It on a Seedbox?

Usenet is fast. A decent provider on a 1 Gbit home connection saturates the line; on a 10 Gbit seedbox, downloads complete in seconds. The other piece is automation: SABnzbd needs to be reachable from Sonarr and Radarr, and that's easier when it's on the same box.

Bytesized handles all of that:

• 10 Gbit upload and download, so even big releases are quick
• One-click install, no Python virtualenv hassle
• Reverse proxy with HTTPS already set up
• Sonarr, Radarr, Lidarr, Prowlarr install on the same panel
• EU servers in Luxembourg, France, and Netherlands

Installing SABnzbd

Open the Bytesized Panel, find SABnzbd in the app catalog, click install. The panel takes care of the install, the reverse proxy, and gives you a clean HTTPS URL.

Click "Open" to land on the setup wizard.

First-Run Setup

The wizard walks you through:

1. Server credentials. Add your Usenet provider's server, port, and login. Most providers ship details on their dashboard.
2. Categories. Default categories are fine. Sonarr will use tv-sonarr, Radarr will use radarr.
3. Download path. Standard Bytesized layout is ~/files/incomplete and ~/files/complete for the staging and final paths.

Once the wizard is done, drop a test NZB into the queue to confirm everything's wired up.

Picking a Usenet Provider

SABnzbd needs three accounts to actually be useful:

• A provider for the actual binary downloads. Common picks include Eweka, NewsgroupDirect, Frugal, or UsenetServer.
• A backup provider with a different backbone, in case the primary is missing parts. Cheap secondary plans cover this.
• An indexer to find NZB files. NZBGeek, DrunkenSlug, NZB.cat are common.

Bytesized doesn't sell or recommend specific providers; pick what fits your budget. Plans typically run EUR 5 to EUR 15 a month, with unlimited usage.

Sonarr / Radarr Integration

In Sonarr's Settings > Download Clients > Add > SABnzbd:

• Host: internal URL from the panel
• Port: the SABnzbd port (in the app settings)
• API Key: SABnzbd's Settings > General > API Key
• Category: tv-sonarr

Same for Radarr with radarr as the category. Test connection; if it's green, you're done.

Post-Processing

SABnzbd's post-processing handles repair (PAR2), unpack (RAR), and clean up. The defaults work for 95% of releases. The setting most people tweak:

• Direct Unpack. Speeds up unpacking by starting it before the download finishes. Saves time on big releases.

Common Gotchas

Connections rejected. Provider is over your connection limit, or your password is wrong. Check the provider's dashboard for active sessions.

PAR2 takes forever. Some PAR2 implementations are CPU-bound. The Bytesized build uses the fast multi-core variant; if you've configured a custom path, switch back to the bundled one.

Sonarr can't connect. Use the internal URL from the panel, not the public HTTPS one. The internal URL avoids Cloudflare and reverse proxy hops.

Repair runs but file still broken. Provider is missing parts. This is what the backup provider is for; add it under Settings > Servers and SABnzbd will fall back to it automatically.

SABnzbd vs NZBGet

Both work. The honest comparison:

• SABnzbd. Bigger feature set, friendlier UI, written in Python.
• NZBGet. Lighter on resources, written in C++. Faster on weak hardware.

On a Bytesized seedbox the resource difference doesn't really matter; pick by UI preference.

For the deeper picture, see the Usenet topical guide.

FAQ

Is SABnzbd free? Yes. Free and open source.

Does Bytesized include a Usenet provider? No. You bring your own provider account. Plans typically run EUR 5 to EUR 15 a month.

Can I run SABnzbd and a torrent client at the same time? Yes. They install side by side. Sonarr and Radarr can use both, falling back from one to the other.

Will it work with Prowlarr? Prowlarr manages indexers, not downloaders. You connect Prowlarr to your indexer, then point Sonarr and Radarr at SABnzbd as the download client.

How does PAR2 actually work? Usenet posts are split into many small files; PAR2 is the redundancy layer. If some files are missing, PAR2 reconstructs them from the parity files. SABnzbd does this automatically.

Ready to Set It Up?

Browse Appbox plans, install SABnzbd, point your Usenet provider's credentials at it, and you're downloading in five minutes flat.