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If you encounter the following error message while trying to backup the internal database (IDB):

Error
Putting the Internal Database into the backup mode failed.

The reason might be due to the backup being initiated by the Inet process which may run as a certain user account that has not been added to the impersonation of the cell manager.

To resolve, follow these steps:

  1. Start the DP GUI. Choose "Clients"
  2. Right-click the cell manager, delete the existing impersonation.
  3. Add a new impersonation and enter the correct credentials (usually the service account).