I have a backup job with 1 VM in it with 1 disk that is sized at 4.9 TB. However, only 3.65 TB is used on that disk.
When the backup job runs an active full, after 2.5 TB has been backed up, the job status is 50% complete and the job line item shows "Hard disk 1 (4.9 TB) 2.5 TB read at xxx MB/s". Once the 3.65 TB is backed up, the percentage magically increases to 99% and the job finishes. It does show the total VM used space earlier in the job details, but not the per-disk used space. (That's moot for this example. But it is applicable to other VMs.)
I'd prefer if these stats referenced the actual used space instead of disk provision size.