Deja-Dup is not able to recover files from encrypted backup

[Xwarman]

I am trying to recover an file from an encrypted backup via nautilus context menu "find lost files" (german verschwundene dateien wiederherstellen) .
- If I am trying it, it tells me to connect my backup hdd
- after that it does not ask for my encryption phrase (like it does if I am trying to make a scheduled backup). Instead its trying to find missing files but does not find anything. (how should it, without access to the encrypted data)

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: deja-dup 30.0-0ubuntu4
ProcVersionSignature: Ubuntu 3.13.0-40.69-generic 3.13.11.10
Uname: Linux 3.13.0-40-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 2.14.1-0ubuntu3.6
Architecture: amd64
CurrentDesktop: Unity
Date: Tue Nov 18 20:25:44 2014
InstallationDate: Installed on 2012-03-11 (982 days ago)
InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Release amd64 (20111011)
SourcePackage: deja-dup
UpgradeStatus: Upgraded to trusty on 2014-05-19 (183 days ago)