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Media downloader (Arr stack)
Workload guide · Media

Media downloader (Arr stack): hardware requirements guide

Sonarr/Radarr/Prowlarr/SABnzbd/qBittorrent automation stack.

Always-on 24/7

Hardware requirements by tier

Three tiers for every workload: the minimum that works, the recommended sweet spot, and the comfortable headroom level. These are the same tiers the WisePC decision engine uses when it plans a build around your goal.

TierCPU coresRAMStorageGPUVRAMNetwork
Minimum2 cores4 GB2 TB (hdd)None—1 GbE
Recommended4 cores8 GB8 TB (hdd)None—1 GbE
Comfortable8 cores16 GB24 TB (hdd)None—2.5 GbE
Overkill13 cores26 GB48 TB (hdd)None—2.5 GbE

Beyond Comfortable — 13 cores, 26 GB RAM, 48 TB (HDD): headroom you will never use for this workload alone. Put the difference into storage, backup or silence.

Recommended system shape

Derived by the decision engine from the recommended tier — the same logic that plans full builds.

Form factor
tower
3× 3.5″ bays
Build style
diy
Drive plan
3× 6TB HDD

Requirements (4 threads, 8GB RAM, 32TB storage) need a custom tower build.

One box or a separate machine?

Consider a separate machine

Can grow past 24TB of storage — a dedicated NAS keeps the disk array and its redundancy separate from the compute that must stay up.

Whether this workload deserves its own system or should live on the main server.

Storage arrays, priced

Five physical strategies for the recommended capacity — the same planner, drive model and reference prices as the storage planner tool.

StrategyDrivesUsableCostIdle
Cheapest 2× 8TB hdd8 TB · parity1≈ €82410 W
Balanced Recommended2× 16TB hdd16 TB · parity1≈ €139612 W
Redundant 3× 8TB hdd8 TB · parity2≈ €123615 W
Expansion-friendly 2× 20TB hdd20 TB · parity1≈ €175614 W
Performance 3× 4TB nvme8 TB · parity1≈ €23643 W

The balanced strategy gives you parity protection for a modest cost per TB — the right default for a family archive.

Backup is not storage

The extra copy that survives drive failure, deletion and ransomware — the same engine as the backup planner.

For 8TB of irreplaceable data, go straight to the full 3-2-1 — a local NAS plus an offsite copy.

Recommended: Full 3-2-1
3 copies, 2 media, 1 offsite — the gold standard · ≈ €466 + €96/yr
critical
No offsite copy

Add a second copy outside the building — cloud or a drive at a friend's house.

medium
No versioning

Use a versioning-aware tool (restic, borg, Backblaze) that keeps history.

medium
Unscheduled backups

Schedule backups automatically and monitor them.

high
Backup on the same machine

Keep the backup on separate hardware or offsite.

What will it cost?

Market-neutral EUR bands from the reference drive model (≈ = estimated street price). Live component prices resolve on the build page for your region.

Storage array
≈ €824 – €2364
Array energy / year
≈ €103/yr
∼47 W idle

Compute (CPU, board, RAM, GPU) is not included — see the recommended build for live prices.

Growth outlook

What happens when the data keeps growing — the same engine as the growth simulator.

Storage stays within 24TB across the 3-year horizon — the architecture fits your expected growth.

Within capacity and bays — no new bay needed for 14TB.

Which tier do you need?

  • Pick Minimum (2 cores, 4 GB RAM) only for a single-purpose machine on a tight budget — expect little headroom.
  • Recommended (4 cores, 8 GB RAM) is the sweet spot: enough for the workload plus the usual side-services, without overspending.
  • Pick Comfortable (8 cores, 16 GB RAM) when this workload shares the machine with others or will grow — you pay for headroom, not for anxiety.
  • GPU rule for this workload: None.GPU rule for this workload: None (no discrete VRAM needed).
Keep going

Frequently asked questions

How much RAM does media downloader (arr stack) need?
4 GB is the sensible minimum, 8 GB covers most real setups, and 16 GB gives comfortable headroom for growth and extra services.
How many CPU cores does media downloader (arr stack) need?
A 2-core CPU is the minimum, 4 cores is the recommended sweet spot, and 8 cores is comfortable when it shares the machine with other workloads.
Does media downloader (arr stack) need a dedicated GPU?
No — integrated graphics or a headless setup is enough.
What storage and network does media downloader (arr stack) expect?
Storage: 8 TB of HDD is the recommended baseline (2 TB minimum, 24 TB comfortable). Network: 1 GbE is the recommended baseline.
What runs well alongside media downloader (arr stack)?
It pairs naturally with: Plex, Jellyfin.
How much power does media downloader (arr stack) use?
The storage array idles around 47 W (≈ 103 €/year at 0.25 €/kWh). The full system adds CPU, board and fans on top — see the cost section for the honest bands.

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