Déjà Dup

Error on backup "Your backup appears to be corrupted"

Asked by Saul Dobney

I'm using Deja-Dup over SSH to backup a local system to a remote server - this has been running no problem for about 15 months. Deja-Dup has just done a new full-backup (about 3 weeks to complete) and now I have the message "Backup failed: Your backup appears to be corrupted. You should delete the backup and try again"

I've been through the questions and bugs, but I can't find any explanation as to the problem, or a solution.

In particular, it's not clear what the exact problem is (where do I find the error logs?) - whether this is a local or remote problem, software, corrupted file somewhere or something else. I also don't want to just start deleting files and hoping without know which ones and that it's safe. The Deja-dup files are obviously compressed and I don't want to break the incremental backup chain, and I can't find instructions as to how to delete erroneous backups. I also don't want to simply switch backup destination and start again, as I don't want to lose access to the historic backups for compliance reasons, and I don't fancy another 3 weeks doing a full backup.

I'm very happy to dig around at the command line, but I need to be absolutely sure I keep access to historic backups.

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Michael Terry (mterry) said : 		#1

Running "DEJA_DUP_BACKUP=1 deja-dup --backup" might give more information.

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Saul Dobney (saul-dobney) said : 		#2

Thanks Michael. I've tried the command, but even with the DEJA_DUP_BACKUP=1 flag set, Deja-dup isn't showing any output (and if I add a pipe to a file nothing gets sent) and I still get the same error (this is deja-dup vn 30.0 on Ubuntu 14.04.3).

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Launchpad Janitor (janitor) said : 		#3

This question was expired because it remained in the 'Open' state without activity for the last 15 days.

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Saul Dobney (saul-dobney) said : 		#4

Further update for anyone else seeing this. It seems the backup is OK as I can restore test files despite the message. It seems then to be related to the final backup verification step which I understand to just involve restoring the Deja -dup README file as a check. I have the ~/.cache excluded from deja-dup backup. This could be a cause.