Forum ©XSIBackup: ©VMWare ©ESXi Backup Software

The scope of --check on a single backup or single VM in a backup is clear as all map files are displayed as they are checked.
However, it is unclear to me what is actually checked when a complete repositiory containing several backups is given as the argument.
There is only a global percentage displayed but not what is actually checked.
Each map file in all VMs of all backups?
Only the .blocklog?