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Unable to save backup task

Thread needs solution

I can't create a backup task. Here's the error message:
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Error
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Failed to create the backup plan.
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Details
Code: 10.616.865(0xA20021)
LineInfo: 0xA9EB70AA1C10E9C5;

Module: C:\Program Files\Acronis\BackupAndRecovery\mms.exe
Message: Failed to create the backup plan.

Code: 10.616.866(0xA20022)
LineInfo: 0x5FF111DC99E03D81;

Message: Failed to create the archive.

Code: 4.194.944(0x400280)
LineInfo: 0xA1D3981537C6870C;

Module: C:\Program Files\Acronis\BackupAndRecovery\mms.exe
Message: Failed to open the metadata directory.

Code: 4.194.318(0x40000E)
LineInfo: 0x97675718D2B52D17;

Message: Failed to open the backup location.

Code: 262.164(0x40014)
LineInfo: 0xF35F747B3B21FB3D;

Message: Access to the file is denied.

Code: 65.520(0xFFF0)
LineInfo: 0xBD28FDBD64EDB8BC;

Message: Access is denied

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However I can access the backup location successfully via windows explorer.

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I tried to use a mapped drive for the backup share and then new error message:

Additional info: 

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Error code: 640

Module: 64

LineInfo: a1d3981537c6870c

Fields:  IsReturnCode : 1, $module : C:\Program Files\Acronis\BackupAndRecovery\mms.exe

Message: Failed to open the metadata directory.

--------------------

Error code: 36

Module: 64

LineInfo: 97675718d2b52ce2

Fields:  path : administrator

Message: Failed to set the logon information for the backup location.

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Error code: 20

Module: 4

LineInfo: f35f747b3b21faee

Fields:  function : WNetAddConnection3W, filename : Z:

Message: Access to the file is denied.

--------------------

Error code: 65520

Module: 0

LineInfo: bd28fdbd64edb8bc

Fields:  code : 2147943602

Message: The local device name has a remembered connection to another network resource

Hello Pantelis,

Acronis Backup and Recovery doesn't support mapped drives so of you want to save your backups on a network share please use a UNC path.

Also please make sure that you are using right credentials for your vault. 

BTW where is your vault is located?

Thank you.

Let's let asside the fact that it took you two weeks to answer...
The error is shown on UN?C path vaults. And yes, the credentials are correct.
The vault is a UNC path on a NAS.

Hello Pantelis,

the thing is that Acronis Forum is not a main support source at the moment but more of a community effort. That is why we always recommend in case of emergency contacting our support using this web form.

As for the issue itself it will be helpful if we can check if mounting of network share using WNetAddConnection3 function works correctly.

I've sent you a step-by-step guide in a PM.

Thank you.