Can someone provide an overview on Avamar VM image restores and VM disk provisioning relative to the data that was backed up?

That is, I want to better understand the restore process with respect to how a VM's disks will be created/provisioned by Avamar when that VM image backup is restored to "new", restored to "existing" but different, and restored to "original".

Working with a customer and it appears that when they do a restore at their DR site of a VM image that has been replicated from the primary site, all of the disks appear to be created with thick provisioning - and for some disks depending on the VM image being restored, this results in substantially longer restore times due to disks that have large provisioned capacities but not much actual data on them.

(e.g. a disk on the original VM that was thin provisioned for 1TB and only has a few GB on it will restore at the DR site as the full thick provisioned 1TB - or at least it seems to take the time that a 1TB disk would take to restore)

Posting this because I've tried to search for it and can't seem to find anything definitive.

All comments/feedback appreciated - thanks.