I have been backing up faithfully to a FreeNAS 11.1 box for some time now, using SSH as the transport. All has been working really well, but due to an unknown issue (possibly faulty RAM) the FreeNAS server has rebooted unexpectedly, once in the middle of a Duplicati backup.
Since the last unexpected reboot, I now get this error when my backup job runs:
Failed: Hash mismatch on file "/tmp/dup-03cbf397-7527-4c2a-9558-2b7bcf84a1ea", recorded hash
I have followed though a few forum posts on this message, and I ran a verify of my backups according to How to test / verify your backups
This results in the following output:
ErrorID: FilesetDifferences Unexpected difference in fileset version 5: 27/09/2018 02:00:02 (database id: 109), found 19602 entries, but expected 19603 Return code: 100
That moves me forwards but I’m not quite sure where to go next. I believe I probably have a corrupt ZIP file - I’m presuming an upload got truncated because of the hard reboot of the NAS. I tried running a database repair and the next scheduled backup ran fine. Then the following one errored with the hash mismatch error again, so the problem (I believe) still exists.
What is my best plan to deal with this? I accept that something will probably be lost over this and that’s fine, especially if I’m right and this is a truncated upload. I want my backups to continue from here on without erroring out each time, so at least current changes are being backed up.
Any advice appreciated.