limit upload/download bandwidth

[hovis]

It would be useful to have the option to restrict the bandwidth Duplicity uses when uploading/downloading. Ie, on a 10Mb line, restrict to 5Mb so the line is not saturated during a long backup.

One option when using scp:// used to be to add:-

--scp-command "scp -l 5120"

but this no longer works due to scp-command option being depreciated. Can a generic 'bandwidth limit' option be added?

[Matt Williamson (mddubs)]

Throttling would be a great addition for those of us uploading to S3 and other cloud hosts.

[Matt Williamson (mddubs)]

Found a workaround using trickle which seems to be just fine:

trickle -s -u 500 -d 100 duplicity ...

[EliCoten (launchpad-elicoten)]

Another workaround which I found useful after Googling this topic is WonderShaper https://github.com/magnific0/wondershaper
The advantage of WonderShaper over trickle is that it can adjust bandwidth limiting on the fly, which is particularly useful for a backup that takes days to complete; during the daytime when other users want to use the network you can apply throttling and then at night you can unthrottle it without interrupting Duplicity.

With trickle, if I'm not mistaken you'd have to stop Duplicity and then start it again with/without trickle to change it which causes Duplicity to start the backup again (although incremental mode can somewhat compensate for this, nevertheless its not ideal).

I was encountering a problem that whilst Duplicity unintentionally causing Denial of Service to all other users on the local network due to unintentionally swallowing all the network bandwidth. Further background: https://community.plus.net/t5/Broadband/Uploading-something-dramatically-affects-download/m-p/1531821#M322958