updating correctly?

Hi
I'm not quite sure whether my duplicity is working correctly or not, so I want to give it a shot here by asking. I've created an 3 separate backups. I wrote a script to incrementally update that backup every hour. It looks like this:

#!/bin/sh
export PATH=/sbin:/bin:/usr/sbin:/usr/bin:/usr/games:/usr/local/sbin:/usr/local/bin:/root/bin
export PASSPHRASE=xyz
/usr/local/bin/duplicity incr --log-file /media/duplicity.log --verbosity /media/Dir1 sftp://xxxr:<email address hidden>:zzzzz/Backups/Dir1/

And then of course for Dir2 and Dir3. I've created three scripts because the 2nd backup is run while the third was still running and that gave me errors.
So when I run the script to update incr, let's say for Dir1, it takes quite a long time although there was nothing to update. The entire Backup is about 1,2GB. I'm not quite sure how long it took, but for Dir2 it took me 13 minutes and the backup is 28GB. There were a total of 18MB added to the backup. This is what the log looks like (now nothing has been added to the backup):

http://pastebin.com/kEEB3t39

The actual checking and comparing seems to have took only 8s. But the entire process before, which I'm not quite sure about what it is, took 13 minutes. When I looked at the logs I had these messages in. I'll post the line that worries me:

http://pastebin.com/7WFhPEub

This appears a lot, before anything else happens. Is this supposed to happen? And is it supposed to take that long? The destination server is external.