If you want to use an instance as a restore destination (without backing up the instance), you can manually modify the user name.
On a UNIX platform, the UNIX user name is set for an instance during a full backup of an FSbased backupset. The user name is the operating system user that owns the PostgreSQL data, tablespaces, and archive log directories.
Procedure
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From the navigation pane, go to Protect > Databases.
The Instances page appears.
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Click the instance that you want to modify the user name for.
The instance page appears.
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On the Overview tab, click Edit.
The Edit PostgreSQL instance dialog box appears.
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Click Connection details.
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In the UNIX user name box, change the user name.
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Click Save.