What Is a Big Data Sender (and When Do You Need One)?
A big data sender is a service built to move datasets that are too large for email or ordinary cloud sync — typically anything from a few gigabytes to several terabytes. Instead of attaching the data to a message, you upload it once and share a download link. The recipient opens the link in a browser and downloads the original file, with no account and no software to install.
Why email and sync tools stop working at scale
Most email providers reject attachments above roughly 25 MB. That limit has not meaningfully moved in fifteen years, while the files people work with have grown by orders of magnitude. A single 4K video export, a genomics run, or a database dump will exceed it thousands of times over.
Sync tools solve a different problem. They are designed to keep a folder consistent across devices over time, which means they version every change, hold a local copy on each machine, and require the other party to have an account and available disk space. For a one-off handoff of a 200 GB dataset, that is the wrong shape entirely.
What a big data sender does differently
- Chunked upload. The file is split into pieces that upload independently, several at a time. This keeps throughput up on long-distance links where a single connection is limited by round-trip latency rather than bandwidth.
- Resume after interruption. Completed chunks are tracked, so a dropped connection continues from where it stopped rather than restarting a multi-hour upload.
- Link-based delivery. The recipient needs a browser, not an account.
- Expiry and deletion. The transfer has an end date, after which the files are removed from storage rather than accumulating indefinitely.
- Encryption and passwords. Confidential data is encrypted in transit and at rest, and the link itself can be password protected.
Practical size limits
| Method | Practical limit |
|---|---|
| Email attachment | ~25 MB |
| Free consumer transfer tools | 2–3 GB |
| TeraSender Free | 10 GB total |
| TeraSender Pro | 25 GB per file, 1 TB per transfer |
When you need one
Reach for a big data sender when the payload is a dataset rather than a document, when the recipient is outside your organisation, and when the handoff is a one-off rather than an ongoing sync. Research collaborations, video post-production, off-site backups, CAD and simulation output, and machine-learning training sets all fit that description.
TeraSender is built for exactly this range. See the big data transfer guide for a walkthrough, or read how to send large files step by step.