The T flag on the Cloud in Dell EMC NetWorker represents that the save set will be cloned to a tape device. This allows for the save set to be stored on the tape device in addition to the cloud storage, providing additional backup and redundancy.

NetWorker uses Protection Groups to protect VMware objects, save sets, or clients. Protection Groups allow you to group related objects together, making it easier to manage and run backups.

Block-Based Backup requires that the Igtobbb package is installed on the RHEL server. If this package is not installed, then the Block-Based Backup will fail. The other options are not related to the cause of the issue.

Staging is used to make and keep a second copy of data at all times. This process is used to ensure data redundancy and provide additional protection against data loss or corruption.

The client that initiated the directed recover is known as the source client. This client is responsible for sending the data to the destination client. The destination client is the one that will receive the data from the source client, and the administering client is the one that initiates the recover process. The NMC client is used for monitoring the recover process.