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  # 1055877 29-May-2014 13:11
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aboylikedave: This all sounds good. As an aside I've just done a Speedtest at work and it has upload of 65Mbps.  Does that mean if I sneaked (!) my iMac to work it would be 60 times faster to Backup? Would it cause any major tech problems?


A) Well done on backing up your stuff

B) Well done on choosing Backblaze - I've used it for years and it's been great

C) Apart from the business concerns others have raised, NO, it won't be 60 times faster. Backblaze uploads aren't blistering fast. On a VDSL connection with about 10mbps up, I get about 3-4mbps upstream when I have backups happening.

D) What everyone else said about limiting your upload to 80ish percent is spot on.

I also find that if I want to DL something I just hit pause on teh BB client - it automatically restarts in a couple of hours.

Cheers - N




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Please note all comments are the product of my own brain and don't necessarily represent the position or opinions of my employer, previous employers, colleagues, friends or pets.


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  # 1056123 29-May-2014 18:01
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aboylikedave: Great, Backblaze does let you limit upload speed. Could someone advise on what amount of upload bandwidth is best to leave then for TCP reply packets?


You will receive an ACK from the target for every packet your client sends (from the SYN event to the FIN),  if you re uploading packets at 10Mb/s then you will likely receive ACKS at roughly an equivalent rate - so you may notice your remaining available [download]rate drop by something similar.

If you attempt a download, then the ACKS you need to send back should be roughly at the same rate that data is received. Since you are using an asynchronous connection it is likely your outgoing ACKS for the download will be sent in burst mode. 

It is probable doing both an upload and a download at the same time that congestion will occur on the download (because its ACKS will be slow to be sent), so it may slow its transmission down.






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