The "always" application-specific module should be specified when configuring backups on a client that requires the use of a directive, as this will ensure that certain files are included in the backup regardless of the backup level.

PowerProtect is a deduplication solution from Dell EMC which is supported within a NetWorker environment. PowerProtect provides fast and efficient deduplication of data to reduce storage costs and improve backup performance. It is designed to be easy to use, with an intuitive user interface and support for multiple operating systems and applications.

Infrastructure-as-a-Service (IaaS) is a cloud solution designed for situations where workloads are running entirely in the cloud. IaaS provides users with access to virtualized computing resources, such as storage, networking, and computing power, through a cloud provider.

To troubleshoot why a customer cannot see any files backed up when a restore operation is attempted on their 3 new Linux server named Server01, the first step should be to check the log files for any error messages. The log files are typically located in the /var/log/ directory, but the exact location may vary depending on the operating system being used.
Next, the administrator should check the configuration of the NetWorker server to ensure that the server is configured correctly. This includes checking the client configuration for the Server01 and making sure that the correct client name is being used. Additionally, the administrator should make sure that the Server01 has the correct address and port information, as well as the correct credentials.
The administrator should also check the configuration of the server to make sure that the correct backup policies are being used and that the backup schedule is configured correctly. Additionally, they should check the configuration of the actual backup device, such as the tape library or disk array, to make sure that it is configured properly.
Finally, the administrator should check the filesystem of the Server01 to make sure that the backup files are actually being written to the correct location.

The rap log on a NetWorker server is used to audit recent resource changes, and if the file is empty, it is likely because the Monitor RAP attribute on the NetWorker server is disabled. This attribute must be enabled in order for the rap log to be updated. The other options are not related to the cause of the issue.