You can change the account that the software uses to perform backup and restore operations to the local system account or to a specific account. For information about the required permissions, see User Account Configuration for the SQL Server Solution.
Procedure
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From the navigation pane, go to Protect > Databases. The Overview page appears. 
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On the Instances page, click the SQL Server instance that you want to modify. The instance page appears. 
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In the General section, beside SQL server authentication, click the Edit button  . .The Edit SQL server instance dialog box appears. 
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Move the Override higher levels settings toggle key to the right. 
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Select the account to use. - 
To use the system account, select Use local system account. 
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To use a specific account, select Impersonate user, and then from the Credentials list, select the saved credential. 
 
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Click Update. 
Results
The software uses the updated credentials for the next backup operation or restore operation.
Related Topics
For a video about user permissions, see How to configure user permissions for the SQL agent.