Windows – Backup Windows Server to NAS

backupnaswindows-server-2012-r2

I have a Windows Server 2012 R2 that I want to backup to a synology NAS (412+) network share.

I've created a shared folder on the NAS.

In windows backup when I select "Backup Schedule…" and go through the wizard I select:

  • Back up to a shared network folder
  • I add "\nas\backup\etc…" under the Location: field (I can browse to that directory via windows exporer and create files in it).
  • Then I press "Next" and I get Windows Security showing me a dialog to provide my credentials.
  • I click "Finish" and then I get: "Creating backup schedule…"
  • a few moments later: "The user name being used for accessing the remote share folder is not recognized by the local computer".

which fails the backup.

My nas is added to the domain (so I enter a domain user credentials, that has access to the folder)

I've also tried different ways to sign in (user, local server user, nas user, domain\user, user@domain, user@domain.local, domain.local\user, …) everytime with the same message.

I've mapped a network drive but in Windows Backup I cannot select that mapped network drive (e.g. Z:\ ) to backup.

At synology support, I don't know if they don't care but their suggestions don't work (and sometimes they think I want to backup my nas, instead of creating a backup of a server to a nas.).

Anyone who has more info to solve this?
(I've also disabled SMB 2 and Large MTU)

Best Answer

A domain user should be used to do the backup. Because the NAS is belong to a domain, you should give access to a share folder to a domain user, and use DOMAIN\username. This use the correct format.

Alternatively, make a new user in active directory with the same name as the local user on your NAS Drive (QNAP) and then make the user a member of admins or backup operators.

Any other combinations than the two above are very unlikely to work.

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