[minot]

I don't have a fat enough pipe to confirm or deny 10 MB/s but here's my experiment uploading a few RAW photo files (~25 MB each). Seems good enough. I haven't tried download speed though. For what it is worth, downloading files from the web interface in Microsoft OneDrive (previously SkyDrive) is ridiculously slow.

I think there is a distinction to be made between syncing (Dropbox, Google Drive, Barracuda Copy, Microsoft OneDrive and so on) and back ups. The providers try to blur the lines with features like trash can (where files go when you delete and you have to delete again), file history so you can go to a previous version of a file, selective synchronization so you can only download files you need and so on. However, I'd say the distinction still remains because we need to measure backups by how easily and quickly we can recover in case of a disaster.

At 10 TB, I'd imagine OP falls in the latter category. If they limited us to 200 kbps unless we paid extra, that'd be a big fail.

That being said, I doubt they'd do that. Here's a screenshot of me reaching 37 mbps peak upload:

https://i.imgur.com/1tSr48U.png

Edit: I take it back. Upload from the web interface stalled. https://i.imgur.com/UC8qWA4.png

[minot]

I don't know why the upload stalled but I went back to upload the rest of the files and it worked. I tried downloading and it was a little under 2 mbps which isn't that great.