I'm using Duplicity under CentOS 7 to back up to Backblaze B2, running from my home network. Due to the size of my backup and my comparatively slow upload speed (1.8 Mbps), it takes several weeks to run a full backup. If I let it run unthrottled, it hogs all the bandwidth - all other devices on my network have difficulty connecting to outside websites, etc.
On my router (Asus RT-ACRH17), I tried setting outgoing traffic from that machine to lowest priority, but apparently the router's QoS isn't actually functional; all the combinations of settings I've tried (including those provided by Asus support) have no effect whatsoever.
I've also tried using iptables to set the DSCP priority to CS1. This doesn't seem to have any effect either, though I did confirm (on the CentOS machine) that the priority is being set.
For the moment, I've used my router settings (Bandwidth Limiter instead of proper QoS) to throttle that particular computer down to 1.4 Mbps maximum. Two downsides - this increases how long the backup takes, and if other devices need more than 0.4 Mbps total then they get bogged down again.
Is there a way of setting the network (not processor) priority for Duplicity to "lowest", so all other traffic gets to go first? Does this require something specific in the router to get it to work?
albegadeep