Block-Level Backup Option Is Not Visible
Article ID: WFS0013 The block-level backup option, Optimized for File system with large number of small files (Block Level Backup), is not visible on a Windows subclient.
When you try to configure block-level backups on a Windows subclient, the Optimized for File system with large number of small files (Block Level Backup) option is not available under Client Computers > Client > Windows File System > Backup Set > Subclient > Advanced Options.
Windows clients that were upgraded from v9 or v10 to v11 do not support block-level backups.
Install a new v11 Windows client and then enable block-level backups.