Comment 17 for bug 401094

I use duplicity to backup 28 GB of data to the local hard drive. I only have problems with the bandwith of duplicity.
If I try to copy files to an external hard drive over esata, I get 80-110 MB/sec according to rsync. But, with duplicity I only have a bandwidth of 1 MB/sec according to iotop during an incremental backup to the internal hard drive. During the backup no other processes are running that are using a lot of bandwidth. Is there a way to speed up the backup process?

These are my hardware and software specifications:

root@xeon:~# free
             total used free shared buffers cached
Mem: 8195568 8095008 100560 0 20216 7504640
-/+ buffers/cache: 570152 7625416
Swap: 9764856 0 9764856

root@xeon:~# uname -a
Linux xeon 2.6.32-24-server #43-Ubuntu SMP Thu Sep 16 16:05:42 UTC 2010 x86_64 GNU/Linux

root@xeon:~# cat /etc/lsb-release
DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=10.04
DISTRIB_CODENAME=lucid
DISTRIB_DESCRIPTION="Ubuntu 10.04.1 LTS"

root@xeon:~# duplicity -V
duplicity 0.6.08b

I have a quadcore Xeon X3220 @ 2.40GHz and two internal hard drives in raid 1 with a hot spare managed by mdadm.