# Error Message has been altered
**URL:** https://forum.duplicati.com/t/error-message-has-been-altered/18848
**Category:** Uncategorized
**Created:** [August 22, 2024, 6:09pm UTC](https://forum.duplicati.com/t/error-message-has-been-altered/18848 "2024-08-22T18:09:40Z")
**Posts on this page:** 7
**Page:** 1
### Author:  [@titou43](https://forum.duplicati.com/u/titou43)
#### Post date: [August 22, 2024, 6:09pm UTC](https://forum.duplicati.com/t/error-message-has-been-altered/18848/1 "2024-08-22T18:09:40Z")
Hello
Sorry for my poor englsih, I am frenchee :
I have an error with a backup (name ClaudeNew) (I have 9 regular backup …same encoding, same source (different folder), same destination…same option of backup (alert, mail…)
The alert is :
_Échec du déchiffrement des données (phrase de passe invalide ?) : Message has been altered, do not trust content_
If I do the maintenance of the local base of the Backup ClaudeNew like :
Repair : the backup can be made one time but after I have the error
Regen and repair : it is the same, the backup can be made one time but after I have the error who reappears…
Does anyone has an solution ?
Claude From France
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### Author:  [@ts678](https://forum.duplicati.com/u/ts678)
#### Post date: [August 23, 2024, 1:40pm UTC](https://forum.duplicati.com/t/error-message-has-been-altered/18848/2 "2024-08-23T13:40:34Z")
> [@titou43](#):
>
> same destination
Don’t ever keep multiple Duplicati backups in the same destination, but you might mean different folders there. What is the Storage Type of the destination? Whatever it is may be corrupting files.
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### Author:  [@titou43](https://forum.duplicati.com/u/titou43)
#### Post date: [August 23, 2024, 1:59pm UTC](https://forum.duplicati.com/t/error-message-has-been-altered/18848/3 "2024-08-23T13:59:14Z")
I have explain with no precisions (sorry)
When I say same destination I would like say same destination (pcloud)
But all my backup take different folders and the backup goes into a different folder too
I have a backup (ClaudeNew) who take folder 1, folder 2 and folder 3 (for example)
And the bakuping is done on Pcloud on a folder named ClaudeNew
I have a backup (TotoNew) who take folder 4, folder 5 and folder 6 (for example)
And the bakuping is done on Pcloud on a folder named TotoNew
Hope this is clear …
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### Author:  [@kenkendk](https://forum.duplicati.com/u/kenkendk)
#### Post date: [August 28, 2024, 10:47am UTC](https://forum.duplicati.com/t/error-message-has-been-altered/18848/4 "2024-08-28T10:47:01Z")
> [@titou43](#):
>
> Message has been altered, do not trust content
I am not sure exactly how you got into this situation, but the error message simply states that whatever data you are trying to decrypt has been altered in some way.
This means that the key is correct and contents can be decrypted, but parts of the file does not contain the expected contents. The most likely cause is corrupt storage.
However, Duplicati should be able to detect that the hash of the file has changed since it was uploaded, in case it is corrupted, so I would expect the original error to be related to remote storage not having correct files. If you delete the local database and then repair from that, you loose the hashes of files before upload, and you would not see it before you attempt to decrypt the files.
I would suggest renaming or removing the offending file from the remote destination and then attempting to use “[purge broken files](https://forum.duplicati.com/t/how-to-list-purge-broken-files/3884)” to get back to a working state.
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### Author:  [@ts678](https://forum.duplicati.com/u/ts678)
#### Post date: [August 28, 2024, 12:14pm UTC](https://forum.duplicati.com/t/error-message-has-been-altered/18848/5 "2024-08-28T12:14:00Z")
> [@ts678](#):
>
> What is the Storage Type of the destination? Whatever it is may be corrupting files.
Storage Type is the first choice on the Destination screen, but pCloud is not available.
Possibly you are using “Local folder or drive” but it is actually pCloud Drive virtualized.
Some previous reports of errors doing it that way are:
[Error during auto backup](https://forum.duplicati.com/t/error-during-auto-backup/16437)
[Error on linux mint](https://forum.duplicati.com/t/error-on-linux-mint/17407)
Possibly you are using WebDAV.
[pCloud natively supported by Duplicati?](https://forum.duplicati.com/t/pcloud-natively-supported-by-duplicati/17493) discusses the unreliability of WebDAV usage,
although there was a comment there about a European server that was more reliable.
[Recovering by purging files](https://docs.duplicati.com/en/latest/08-disaster-recovery/#recovering-by-purging-files) discusses a generic path of recovery from corrupted files.
Removing the corrupted file triggers it. Do you know the names? If not, try watching in
About → Show log → Live → Warning
A concern is you might have other corrupted files. The download-to-check is a sample.
[Verifying backend files](https://docs.duplicati.com/en/latest/03-using-the-graphical-user-interface/#verifying-backend-files)
It is possible to test all files, but the best way depends on things like the Storage Type.
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### Author:  [@titou43](https://forum.duplicati.com/u/titou43)
#### Post date: [August 28, 2024, 12:41pm UTC](https://forum.duplicati.com/t/error-message-has-been-altered/18848/6 "2024-08-28T12:41:30Z")
Hello @kenkendk@ts678
I have suppress all my backup distant (yes a Pcloud drive virtual…) and remake a new backup properly.
The problem was gone at the first backup…
The second backup was passed OK too…
I will return here after one or two week for give result … but it seems the problem is solved
Claude (From FR)
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### Author:  [@ts678](https://forum.duplicati.com/u/ts678)
#### Post date: [August 28, 2024, 3:07pm UTC](https://forum.duplicati.com/t/error-message-has-been-altered/18848/7 "2024-08-28T15:07:52Z")
> [@titou43](#):
>
> but it seems the problem is solved
If it stays away awhile, great. You might want to raise [backup-test-samples](https://docs.duplicati.com/en/latest/06-advanced-options/#backup-test-samples) (default is just 1).
[backup-test-percentage](https://docs.duplicati.com/en/latest/06-advanced-options/#backup-test-percentage) is another way to get more intensive checking of file integrity awhile.
I don’t know if it will increase downloading or if data will come from cache on drive somehow.
[The TEST command](https://docs.duplicati.com/en/latest/04-using-duplicati-from-the-command-line/#the-test-command) can run this sort of test occasionally on demand, if you prefer that plan.
[upload-verification-file](https://docs.duplicati.com/en/latest/06-advanced-options/#upload-verification-file) uploads a file which can be passed to utility-scripts\DuplicatiVerify.ps1
This option uses local file access, which possibly (results may vary) way to test all of the files.