Thanks for this log. It shows that your current backup chain started on Oct 10, contains the offending incremental backup (Dec 19 to Dec 20), and has later incremental backups (three more on Dec 20, one on Dec 21, one on Dec 22, one on Dec 30). You can see for yourself under "primary backup chain" (you also have 9 older backup chains).
So your backups are apparently still performed, despite the error message (!?!). As far as I understand, the SHA1 hash mismatch means that the indicated file (first volume of Dec 19 to Dec 20 incremental backup) is different from when it was created and its SHA1 hash was written in the accompanying .manifest file (a text file that stores the hashes of each volume at creation time). Is it conceivable that the transfer of this file to your backup location failed somehow? Or that it was modified afterwards? I think the easiest way for you to get rid of this issue is to delete (or rather, move away) the tail of your current backup chain, starting at the offending file, and launch an incremental backup to cover the Dec 19 to today period. That won't tell us how this file got corrupted however, but I for one am not able to help further. You may also want to delete (or rather move away) Déjà-Dup's cache directory (~/.cache/deja-dup) in case something weird creeped into it and is causing a problem. It will be recreated with fresh information downloaded from the backup location (manifest and signature files). -- 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/1651396 Title: Backup fails every time after one incremental file is possibly corrupted Status in deja-dup package in Ubuntu: New Bug description: The backup location is on a NAS mounted with NFS. I get this message every time I try to make a new backup: Backup Failed Invalid data - SHA1 hash mismatch for file: duplicity-inc.20161219T001458Z.to.20161220T001456Z.vol1.difftar.gpg Calculated hash: 3dde403f81e36268ce9b7f53478d9dd8301a439c Manifest hash: b46782fb799c7c5a543ac88d9bfb7cc1df25d38c Can someone recommend a better backup software for personal use? ProblemType: Bug DistroRelease: Ubuntu 16.04 Package: deja-dup 34.2-0ubuntu1.1 ProcVersionSignature: Ubuntu 4.4.0-53.74-generic 4.4.30 Uname: Linux 4.4.0-53-generic x86_64 NonfreeKernelModules: nvidia_uvm nvidia_drm nvidia_modeset nvidia ApportVersion: 2.20.1-0ubuntu2.4 Architecture: amd64 CurrentDesktop: Unity Date: Tue Dec 20 12:36:15 2016 InstallationDate: Installed on 2014-05-16 (949 days ago) InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417) SourcePackage: deja-dup UpgradeStatus: Upgraded to xenial on 2016-08-02 (139 days ago) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/deja-dup/+bug/1651396/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp
