After a fresh install of 13.10, a few minutes after using it (I opened several programs), system became very unresponsive, to the point that mouse cursor was almost frozen on screen (it would move a few seconds after I move the mouse), and doing anything with computer was almost impossible. At the same time, I noticed that something is working heavily with hard disk (I have 3, and I don't know which one). After several minutes of unresponsiveness, I managed to restart the computer from console (ctrl+alt+f1; this also took some 30 seconds from pressing to actual console screen).
After the restart, exactly the same has happened. I tried to restart several times after that and it was all the same. After a while, I installed iotop and found that deja-dup-monitor was making enormous disk readings. I killed its process and system became responsive again. After that, I disabled autostart for deja-dup-monitor and had no problems with it since.
I don't know why this program behaves as it does, but I think that it is unacceptable behaviour, especially on a fresh install. As I remember, I had the same experience with my previous install, 12.04 (removed deja-dup completely).
ProblemType: Bug
DistroRelease: Ubuntu 13.10
Package: deja-dup 27.3.1-0ubuntu1
ProcVersionSignature: Ubuntu 3.11.0-14.21-generic 3.11.7
Uname: Linux 3.11.0-14-generic x86_64
NonfreeKernelModules: fglrx
ApportVersion: 2.12.5-0ubuntu2.1
Architecture: amd64
Date: Sun Dec 8 12:30:49 2013
InstallationDate: Installed on 2013-12-06 (2 days ago)
InstallationMedia: Ubuntu 13.10 "Saucy Salamander" - Release amd64 (20131016.1)
MarkForUpload: True
SourcePackage: deja-dup
UpgradeStatus: No upgrade log present (probably fresh install)
mtime.conffile..etc.xdg.autostart.deja.dup.monitor.desktop: 2013-12-07T13:14:48.848512
Status changed to 'Confirmed' because the bug affects multiple users.