I tried to restore a missing file with nautilus context menu "restore missing 
files".
Deja-dup showed the error message:
Fehler beim Erstellen des Ordners: Der Dateiname ist zu lang
(retranslation: error creating the folder: The filename is to long.)

Restoring the same file on another ubuntu-system without home encrytion
works instead without any error message.

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https://bugs.launchpad.net/bugs/1635874

Title:
  deja-dup can not restore long path and filenames when restored on an
  encrypted home directory (backuped without home encrytion

Status in deja-dup package in Ubuntu:
  New

Bug description:
  I tried to restore my deja-dup backup after a new install migrating
  from 14.04.x to 16.04.01. I choose to make a fresh install because
  need to encrypt data. Because of known bugs with encrypted swap I use
  the option to encrypte the user-directory.

  Because of a problem with a big files (bug report may follow) at the
  end of the backup I had to restore directories by choosing "set back
  to an earlier version" (retranslation from german "Auf frühere Version
  zurücksetzen") for one dirctory after another.

  After a big directory (ca. 70 GB) deja-dup ends the restoring process with an 
error message: "The following files could not be restored. Please ensure that 
you have write premission for them." (retranslated from german translation)
  Deja-dup did not tell something about too long path/filename.

  Here are two examples from the list with 28 files (they are not
  directly in root but in the Documents-Folder inside the user
  directory):

  '/MATERIAL/PHYSIK NAWI/Überblick zur DVD Relativitätstheorie und
  Gravitationswellen. Spannende Filme über eine 100 Jahre alte Theorie
  und ihre höchst aktuellen Anwendungen.pdf'

  '/FALDERA/12-Physik/12.2 Quantenphysik des Lichts/04 --
  Lichtelektrischer Effekt/Albert Einstein: Über einen die Erzeugung und
  Verwandlung des Lichtes betreffenden heuristischen Gesichtspunkt. In:
  Annalen der Physik. 322, Nr. 6, 1905 -- 1905_17_132-148.pdf'

  Because restoring my backups to an unencrypted home directory worked
  before, it could be related to the encrypted user-directory.

  Thanks for all effort and
  kindest regards

  $ lsb_release -rd
  Description:  Ubuntu 16.04.1 LTS
  Release:      16.04

  $ apt-cache policy deja-dup
  deja-dup:
    Installiert:           34.2-0ubuntu1
    Installationskandidat: 34.2-0ubuntu1
    Versionstabelle:
   *** 34.2-0ubuntu1 500
          500 http://de.archive.ubuntu.com/ubuntu xenial/main amd64 Packages
          100 /var/lib/dpkg/status

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: deja-dup 34.2-0ubuntu1
  ProcVersionSignature: Ubuntu 4.4.0-45.66-generic 4.4.21
  Uname: Linux 4.4.0-45-generic x86_64
  ApportVersion: 2.20.1-0ubuntu2.1
  Architecture: amd64
  CurrentDesktop: Unity
  Date: Sat Oct 22 20:30:22 2016
  EcryptfsInUse: Yes
  InstallationDate: Installed on 2016-10-21 (1 days ago)
  InstallationMedia: Ubuntu 16.04.1 LTS "Xenial Xerus" - Release amd64 
(20160719)
  ProcEnviron:
   LANGUAGE=de_DE
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=de_DE.UTF-8
   SHELL=/bin/bash
  SourcePackage: deja-dup
  UpgradeStatus: No upgrade log present (probably fresh install)

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