Hi @TD Knight ,
SQL Server supports virtualization-aware backup solutions that use volume shadow copy (VSS) also named volume snapshots. For example, SQL Server supports Hyper-V and VMware backup.
You should notice that these backups have value 7 in the column "device_type" (7 means Virtual device). These rows are actually very useful, for example it help to know that the Virtual Machine backups are running full database backups on a SQL Server instance. there's no trace of these backup files since they are above the scope of the virtual machine (above the level of your machine) - these are triggered by the host (Hyper-V or VMware for example).
Quote from the blog SQL Server: physical_device_name in the Backup log shows GUID to get more.
But i did not find any blog explain the numbers.
If the response is helpful, please click "Accept Answer" and upvote it, thank you.