I have had the same issue here, but I dont believe ths issue is with Deja-Dup.
In may case I physically chaged the back-up machine (192.168.0.99)

I log into the backup nachine with ssh and ftp

Duplicity provides and error:

duplicity full Travel/ sftp://[email protected]/Backup/ideapad/
The authenticity of host '192.168.0.99' can't be established.
SSH-RSA key fingerprint is <<blah blah blah>>
Are you sure you want to continue connecting (yes/no)? yes
BackendException: ssh connection to [email protected]:22 failed: No 
authentication methods available

ru@ru-460:~$ sudo duplicity full Travel/ sftp://[email protected]/Backup/ideapad/
BackendException: ssh connection to [email protected]:22 failed: No 
authentication methods available

Running Duplicity in verbose mode shows:
u@ru-460:~/.config$ duplicity -v 9 full Travel/ 
sftp://[email protected]/Backup/ideapad/
Using archive dir: /home/ru/.cache/duplicity/7744528ccaaf2107c20395b1fa95181c
Using backup name: 7744528ccaaf2107c20395b1fa95181c
Import of duplicity.backends.u1backend Succeeded
Import of duplicity.backends.localbackend Succeeded
Import of duplicity.backends.ftpsbackend Succeeded
Import of duplicity.backends.rsyncbackend Succeeded
Import of duplicity.backends.gdocsbackend Succeeded
Import of duplicity.backends.tahoebackend Succeeded
Import of duplicity.backends.webdavbackend Succeeded
Import of duplicity.backends.ftpbackend Succeeded
Import of duplicity.backends.hsibackend Succeeded
Import of duplicity.backends.cloudfilesbackend Succeeded
Import of duplicity.backends.botobackend Succeeded
Import of duplicity.backends.sshbackend Succeeded
Import of duplicity.backends.imapbackend Succeeded
Using temporary directory /tmp/duplicity-g16iDW-tempdir
Backend error detail: Traceback (most recent call last):
  File "/usr/bin/duplicity", line 1404, in <module>
    with_tempdir(main)
  File "/usr/bin/duplicity", line 1397, in with_tempdir
    fn()
  File "/usr/bin/duplicity", line 1248, in main
    action = commandline.ProcessCommandLine(sys.argv[1:])
  File "/usr/lib/python2.7/dist-packages/duplicity/commandline.py", line 1002, 
in ProcessCommandLine
    backup, local_pathname = set_backend(args[0], args[1])
  File "/usr/lib/python2.7/dist-packages/duplicity/commandline.py", line 895, 
in set_backend
    globals.backend = backend.get_backend(bend)
  File "/usr/lib/python2.7/dist-packages/duplicity/backend.py", line 161, in 
get_backend
    return _backends[pu.scheme](pu)
  File "/usr/lib/python2.7/dist-packages/duplicity/backends/_ssh_paramiko.py", 
line 182, in __init__
    self.config['port'],e))
BackendException: ssh connection to [email protected]:22 failed: No 
authentication methods available

BackendException: ssh connection to [email protected]:22 failed: No
authentication methods available

Meaning Deja-Dup -> Duplicity -> Paramiko

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You received this bug notification because you are a member of Desktop
Packages, which is subscribed to deja-dup in Ubuntu.
https://bugs.launchpad.net/bugs/851771

Title:
  Permission Denied error during backup

Status in “deja-dup” package in Ubuntu:
  Confirmed

Bug description:
  Deja Dup has been backing up as normal to an external HDD since I have
  been using 11.10 Beta1, but for the last 2 days I have been getting a
  permission denied error. I have not altered any settings and the
  extrenal HDD is performing as normal.

  ProblemType: Bug
  DistroRelease: Ubuntu 11.10
  Package: deja-dup 19.92-0ubuntu1
  ProcVersionSignature: Ubuntu 3.0.0-11.18-generic 3.0.4
  Uname: Linux 3.0.0-11-generic x86_64
  ApportVersion: 1.23-0ubuntu1
  Architecture: amd64
  Date: Fri Sep 16 11:54:40 2011
  SourcePackage: deja-dup
  UpgradeStatus: No upgrade log present (probably fresh install)

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/deja-dup/+bug/851771/+subscriptions

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