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 database Overview page appears.
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Go to the Instances tab.
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Click an instance.
The instance page appears.
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On the Overview tab, in the General tile, click Edit.
The Edit PostgreSQL instance dialog box appears.
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Under the Connection details section, in the UNIX user name box, change the user name.
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Click Update.