I have just started to backup my computer (iMac) to an online backup service (Backblaze). Whilst it performs the initial backup it is naturally maxing out my upload speed (although this is configurable).
However, this upload seems to be restricting (slowing) my download. Using Backblaze's own bandwidth test my available download bandwidth from their server reduces from 4.2Mbps to 1.2 Mbps when the backup upload is turned on.
Backblaze say this should not be the case and that some ISPs might impose their own download restrictions in relation to upload.
Telecom say this is not the case.
Can anyone shed some light on what might be happening here?