Prompt
Should I use file storage or object storage for user attachments?
Latest observation
Oct 12, 2026
OpenAI APIWeb search: off
For most user attachments, object storage is the better default.
Use object storage if you need:
- Scalability: lots of files or growth over time
- Durability/availability: backups, replication, fewer worries about disk loss
- Cheap storage: especially for images, PDFs, videos, logs, exports
- Direct uploads/downloads: via signed URLs
- CDN integration: fast delivery for media
Typical choices:
- Amazon S3
- Google Cloud Storage
- Azure Blob Storage
- MinIO / compatible S3 stores
Use file storage if you need:
- Simple local development or a small internal app
- Very low latency local access on the same server
- Legacy software that expects a filesystem path
- Temporary or ephemeral files that don’t need strong durability
Examples:
- Storing uploaded files directly on the app server’s disk
- Shared network drives like NFS/EFS, if your app specifically needs a filesystem
Rule of thumb
- User attachments in production: object storage
- App-internal temporary files: file storage
- If multiple app instances will access the same files: strongly prefer object storage over local disk
Why object storage is usually safer for attachments
- Avoids losing files when servers are replaced or autoscaled
- Easier to back up and version
- Easier to serve globally
- Separates file lifecycle from app deployment
A common architecture
- App creates an attachment record in DB
- Client uploads directly to object storage using a signed URL
- App stores the object key/metadata in the DB
- App serves downloads through signed URLs or CDN
If you want, I can also give you a decision matrix for “file storage vs object storage” based on your app size, traffic, and compliance needs.