To prevent this issue, use the 'Enable Instant GRT' setting for the backup job. This will create an abbreviated GRT restore selection view for the backup job. However with 'Instant GRT', the disk media will need to be present in order to drill down into the GRT restore selections.

To recover granular data from a backup in this situation, perform the following:

Perform a full redirected restore at the database level of the backup set. While the granular items will be missing from restore selections in this scenario, the top level restore selections are visible. A full database (Exchange, Sharepoint, Active Directory) or Virtual Machine (VMWare, Hyper-V) redirected restore may be performed in order to extract granular items.
Removable disk storage is ejected/removed before the scheduled full GRT catalog operation has been run.
In this scenario, this scheduled full GRT catalog job will fail because the disk media used for the backup is no longer present.
In creating a restore job of granular items (GRT), the items are missing from the restore selections view. This issue occurs if the backup job setting for Instant GRT is set to 'Schedule a full catalog operation as a separate job after the backup finishes' or 'Run a full catalog operation as a separate job immediately after the backup job finishes' and that full catalog job fails or is missed.
ETrack: 3967547