[Error-Duplicati.Library.Main.Operation.TestHandler-Test results]: Verified 98 remote files with 1 problem(s)

Support
1

Hi All

I have been using a Duplicati docker on my UnRAID server for several months and am very happy with it. I have a number of backup jobs which run periodically which seem fine… but a few months back, my daily backup started to report an error every time it backs up. The log shows;

[Error-Duplicati.Library.Main.Operation.TestHandler-Test results]: Verified 98 remote files with 1 problem(s)

However I have tested restoring some files from the ‘failed’ backups and have always managed to get a successful recovery… so I am confident it’s actually working.

So, is there anyone who can help with what this error actually is and how to remedy it? I was deliberating deleting the backup and data and starting again with a fresh backup, but would lose 28 versions of this backup and there is no guarantee it wont just happen again at some point.

I tried to upload a copy of the logfile in txt format but it is not an authorised format, but can paste into forum if this would help?

I am running Duplicati 2.3.0.4 - 2.3.0.4_stable_2026-07-09

Any advice on where to start would be greatly appreciated.

2

Can you see more details in the log? Duplicati is supposed to output what went wrong as well.

Yes, please do, just the parts that seem relevant for the validation error.
You can also send me a PM with a link to the file, if that is easier.

3

Hi @kenkendk

Thanks for the reply. I did have a look through the log before posting but couldn’t see anything, I could recognise, as relevant.

The only thing which showed anything as possibly wrong, was this section which says that a “key is missing”…

"RepairResults": null,
"TestResults": {
"MainOperation": "Test",
"VerificationsActualLength": 100,
"Verifications": \[
{
"Key": "duplicati-20260819T020000Z.dlist.zip.aes",
"Value": \[\]
},
{
"Key": "duplicati-20260808T020000Z.dlist.zip.aes",
"Value": \[\]
},
{
"Key": "duplicati-20260817T020000Z.dlist.zip.aes",
"Value": \[\]
},
{
"Key": "duplicati-20260623T020001Z.dlist.zip.aes",
"Value": \[\]
},
{
"Key": "duplicati-20260721T020001Z.dlist.zip.aes",
"Value": \[\]
},
{
"Key": "duplicati-20260602T020001Z.dlist.zip.aes",
"Value": \[
{
"Key": "Missing",
"Value": "/source/tony/My Paperport Documents/mums letters/EasyJet/"
}
\]
},
{
"Key": "duplicati-20260818T020001Z.dlist.zip.aes",
"Value": \[\]
},
{
"Key": "duplicati-20260811T020001Z.dlist.zip.aes",
"Value": \[\]
},
{
"Key": "duplicati-20260731T020000Z.dlist.zip.aes",
"Value": \[\]
},
{
"Key": "duplicati-20260630T020001Z.dlist.zip.aes",
"Value": \[\]
},
{
"Key": "duplicati-20260707T020001Z.dlist.zip.aes",
"Value": \[\]
},
{
"Key": "duplicati-20260611T020000Z.dlist.zip.aes",
"Value": \[\]
},
{
"Key": "duplicati-20260818T021521Z.dlist.zip.aes",
"Value": \[\]
},
{
"Key": "duplicati-20260814T020000Z.dlist.zip.aes",
"Value": \[\]
},
{
"Key": "duplicati-20260512T020001Z.dlist.zip.aes",
"Value": \[\]
},
{
"Key": "duplicati-20260813T020000Z.dlist.zip.aes",
"Value": \[\]
},
{
"Key": "duplicati-20260816T020000Z.dlist.zip.aes",
"Value": \[\]
},
{
"Key": "duplicati-20260815T020000Z.dlist.zip.aes",
"Value": \[\]
},
{
"Key": "duplicati-20260714T020001Z.dlist.zip.aes",
"Value": \[\]
},
{
"Key": "duplicati-20260616T020001Z.dlist.zip.aes",
"Value": \[\]
}

Thanks

Tony

4

Thanks @kenkendk - I have sent log via PM :slight_smile:

5

This reveals the issue:

As I mentioned in the PM, this is just a folder that is missing, and if it has any content, the content does not appear to be missing.

What you can do, is go to “Restore” the backup. Then pick the time (2026-06-02), and you can then browse the backup as it looked at that time. You can look into it to see if there are any files there.

If you want to fix the error, you can rename/move the file so Duplicati cannot see it. Then run the “Repair” command, which will recognize the file is missing and recreate it based on the database content.

6

Thanks @kenkendk

Credit to kenkendk for this solution…

To summarise, for anyone else finding this topic…

The solution was to locate the dlist file, duplicati-20260602T020001Z.dlist.zip.aes, in the backup folder which was reported as Key Missing - I moved this to another folder so Duplicati couldnt see it.

The ran the repair command on the databse for the errored backup - which recreated the dlist file on the backup media.

Then the following night the backup ran and reported a successful backup with no errors.

Many thanks