Backup quota transformation
In general, this is how acquiring a backup quota and offering item mapping to resource type works: the system compares the available offering items with the resource type, and then acquires the quota for the matched offering item.
There is also a capability to assign another offering item quota, even if it does not exactly match the resource type. This is called the backup quota transformation. If there is no matching offering item, the system tries to find a more expensive appropriate quota for the resource type (automatic backup quota transformation). If nothing appropriate is found, then you can manually assign the service quota to the resource type in the service console.
Example
You want to back up a virtual machine (workstation, agent-based).
First, the system will check if there is an allocated Virtual machines quota. If it is not found, then the system automatically tries to acquire the Workstations quota. If that is also not found, the other quota will not be automatically acquired. If you have enough quota that is more expensive than the Virtual machines quota and it is applicable to a virtual machine, then you can log in to the service console and assign the Servers quota manually.