Stop Download Station from Filling Up Your NAS Storage
Nothing downloads 'just a few files' forever. Left alone, a download station will fill any disk you give it — here is how to fence it in.
✍️ Technical Anshu📦 Synology DSM⏱️ 5 minute read
🎥 Watch the full setup in the video — Download Station installed and downloading, step by step
Every other page in this set makes downloading easier. This one exists because easy downloading has a cost nobody notices until the volume is at 100% and backups start failing: space. A station that fetches all night, every night, grows without asking. Four habits keep it fenced — watching, a quota, proper cleanup, and archiving the keepers.
👆 What an unfenced station does to a volume over a year (values are examples)
1
See It Coming in Storage Manager
A download station fills disks quietly — that is the danger. Build the habit of looking before it is full:
Open Storage Manager in DSM and check the volume's used percentage
Look at the download destination folder's size in File Station — on most home systems it is the fastest-growing folder on the box
Set your own alarm level: when the volume crosses it, clean up that week, not "someday"
2
Put a Quota on the Download Folder
DSM can fence the station in so it can never eat the whole volume:
In Control Panel → Shared Folder, edit the download destination folder
Enable a shared folder quota sized for downloads — big enough for your queue, small enough to protect everything else
When the quota fills, new tasks error instead of silently consuming the space your photos and backups live on
An error you can see beats a full disk you discover during a backup failure.
3
Clean the Queue, Not Just the Files
Half of most download bloat is finished tasks nobody revisited:
Sort the task list by size and look at the giants first
Move keepers to their completed homes (see the folder-system page in this set)
For files you no longer need, delete the task and its data together — deleting only the task listing leaves the big file sitting on the disk
Empty the NAS Recycle Bin for that folder afterwards — deleted files there still occupy space until it is emptied
4
Archive the Keepers Somewhere Cheaper
Some downloads are worth keeping but not worth NAS-grade space: old installers, finished archives, last year's big files. Move them to an external USB drive plugged into the NAS or to your PC, and note what went where. The honest principle underneath all of this page: the station's job is fetching, not hoarding. Fetch, verify, file or delete — and the disk problem mostly solves itself.
⚖️ The standing rule: One rule runs through every page of this set: download only content you have the right to download — your own files, free and legal releases, and media you own or are licensed to use. The station is just a tool; what you point it at is your responsibility.
🎥 See the Complete Setup in the Video
The video shows the destination folder being set during setup — that is the exact folder this page teaches you to protect.
How do I stop downloads from filling the whole NAS?
Put a quota on the download destination: Control Panel, Shared Folder, edit the folder and enable its quota. When the quota is reached, new tasks stop with an error instead of consuming space meant for everything else.
I deleted tasks but the disk is still full. Why?
Two usual reasons: deleting a task listing does not delete its file unless you choose to delete the data too, and deleted files sit in the shared folder's Recycle Bin — still using space — until you empty it.
How much space should a download folder get?
Enough for your normal queue plus a margin — for most homes a few hundred GB is plenty. The right number is the one that lets big downloads finish while making it impossible for the folder to swallow the whole volume.
This guide is based on the Technical Anshu video above • Stuck on a step? Ask in the video comments — that is where answers come from 🙏