Understanding error report: issue1400

I keep getting this error report. What does it mean?

Errors: [
2019-01-26 02:00:23 +00 - [Error-Duplicati.Library.Main.Database.LocalBackupDatabase-CheckingErrorsForIssue1400]: Checking errors, related to #1400. Unexpected result count: 0, expected 1, hash: ffIJryS7UYIeADJ5CaJULuiIzMGKPPCgGD215WzdTVs=, size: 72280, blocksetid: 66583, ix: 92, fullhash: KQLayyLO4i1uSpTvparaUvhOTbyYlT0RHTifxFB/hRU=, fullsize: 9493080,
2019-01-26 02:00:23 +00 - [Error-Duplicati.Library.Main.Database.LocalBackupDatabase-FoundIssue1400Error]: Found block with ID 432410 and hash ffIJryS7UYIeADJ5CaJULuiIzMGKPPCgGD215WzdTVs= and size 68176
]

I have not fully understood the error yet, but it seems to happen when the backup includes a file that changes during the backup, most often the Duplicati database for the job.

It should not be a problem to read a file while it is changing, but there is some logic that trips up and triggers this error.

I excluded /root/.config/Duplicati from my system files backup and the error has gone away.

It looks like I need to backup the Duplicati backup indices somewhere else.

You don’t HAVE to back up the Duplicati databases. It can be rebuilt from back-end storage. That being said, I do back up that database on my larger systems. Idea being I can avoid a possibly lengthy database rebuild.

To do this I use a second, separate backup job. It has in its selection list just the database from the primary backup job. This second backup is triggered automatically when the primary backup completes successfully (I use a post-backup script and duplicati-client to do this).

I have the same problem. I excluded the Duplicati database, but still getting this error.

Any ideas?

Errors": [
"2019-02-21 17:23:56 +01 - [Error-Duplicati.Library.Main.Database.LocalBackupDatabase-CheckingErrorsForIssue1400]: Checking errors, related to #1400. Unexpected result count: 0, expected 1, hash: gf4WNH2wiSE2QTOOo6kM27ug4wlk8oR8XjmF9eOSFYc=, size: 102400, blocksetid: 1935365, ix: 55, fullhash: QgbXLagcAwzvP1feV8IGp7mBsMRJoAhvSMTN+yBUFMU=, fullsize: 5756794",
"2019-02-21 17:23:56 +01 - [Error-Duplicati.Library.Main.Database.LocalBackupDatabase-FoundIssue1400Error]: Found block with ID 8118808 and hash gf4WNH2wiSE2QTOOo6kM27ug4wlk8oR8XjmF9eOSFYc= and size 38659",
"2019-02-21 17:23:57 +01 - [Error-Duplicati.Library.Main.Database.LocalBackupDatabase-CheckingErrorsForIssue1400]: Checking errors, related to #1400. Unexpected result count: 0, expected 1, hash: Af0RoMnox3JTV2D7+xbYqAey9C7naQZkMKluPQ5tyic=, size: 102400, blocksetid: 1935374, ix: 96, fullhash: xy1bULEZ445lSDbFs5UYud+Eb9vmNwc9hkNA2iiXx1U=, fullsize: 9945569",
"2019-02-21 17:23:57 +01 - [Error-Duplicati.Library.Main.Database.LocalBackupDatabase-FoundIssue1400Error]: Found block with ID 8118988 and hash Af0RoMnox3JTV2D7+xbYqAey9C7naQZkMKluPQ5tyic= and size 94654",
"2019-02-21 17:23:57 +01 - [Error-Duplicati.Library.Main.Database.LocalBackupDatabase-CheckingErrorsForIssue1400]: Checking errors, related to #1400. Unexpected result count: 0, expected 1, hash: XYGcK5ZQ8t2NMg/TUEd/ilDEk2FY5WtYOGd+uo2qGes=, size: 102400, blocksetid: 1935379, ix: 124, fullhash: NiHjyh4dWMAZhAFQUa/SJJf31GxDnEJOsjp0FyX+RUQ=, fullsize: 12870614",
"2019-02-21 17:23:57 +01 - [Error-Duplicati.Library.Main.Database.LocalBackupDatabase-FoundIssue1400Error]: Found block with ID 8119119 and hash XYGcK5ZQ8t2NMg/TUEd/ilDEk2FY5WtYOGd+uo2qGes= and size 70513",
"2019-02-21 19:25:15 +01 - [Error-Duplicati.Library.Main.Database.LocalBackupDatabase-CheckingErrorsForIssue1400]: Checking errors, related to #1400. Unexpected result count: 0, expected 1, hash: 00WOOBOQAShUhB0jPnu4nqauH7aMXheq8IPB/zqxEr8=, size: 102400, blocksetid: 1963717, ix: 14, fullhash: hY3MJ4x4v1rMYduUnkgwgQ0O9h4feo5pRkk5URYSAkg=, fullsize: 2348880",
"2019-02-21 19:25:15 +01 - [Error-Duplicati.Library.Main.Database.LocalBackupDatabase-FoundIssue1400Error]: Found block with ID 8203674 and hash 00WOOBOQAShUhB0jPnu4nqauH7aMXheq8IPB/zqxEr8= and size 64912",
"2019-02-21 19:31:21 +01 - [Error-Duplicati.Library.Main.Database.LocalBackupDatabase-CheckingErrorsForIssue1400]: Checking errors, related to #1400. Unexpected result count: 0, expected 1, hash: mVqjysAtvyCAoTXbEu/vD4G+xo2QTbFdGvZe4+UA/nQ=, size: 102400, blocksetid: 1963778, ix: 425, fullhash: MO9Rj6fQVldl1zmff3E4mj96eJDn2neeXuYTszik7jU=, fullsize: 43639565",
"2019-02-21 19:31:21 +01 - [Error-Duplicati.Library.Main.Database.LocalBackupDatabase-FoundIssue1400Error]: Found block with ID 8206127 and hash mVqjysAtvyCAoTXbEu/vD4G+xo2QTbFdGvZe4+UA/nQ= and size 49478"