Scenario: A Citrix Administrator updates all of the machines within a Delivery Group. After the update, an application stops working. The IT manager tells the administrator to revert all machines to t

The 'Rollback machine update' option does not exist at the Delivery Group level - rollback is a Machine Catalog operation because image versioning is owned by the catalog.

Deleting the snapshot associated with the template VM would destroy the rollback point rather than apply it, making recovery impossible.

The 'Rollback machine update' action is available at the Machine Catalog level in Citrix Studio because the catalog is where the master image and its versioning are managed. Executing the rollback from the Machine Catalog reverts all provisioned machines back to the previously assigned master image. The Delivery Group references the catalog but does not own image version control.

Deleting difference disks would corrupt or destroy machine state entirely and would not restore machines to a known-good previous image.