Create a copy-only backup from PowerShell:
Backup-SqlDatabase -ServerInstance 'SalesServer' -Database 'Sales' -BackupFile 'E:\BAK\Sales_Copy.bak' -CopyOnly
Create a copy-only backup from PowerShell:
Backup-SqlDatabase -ServerInstance 'SalesServer' -Database 'Sales' -BackupFile 'E:\BAK\Sales_Copy.bak' -CopyOnly