From 7.5.6 and onwards the Virtual Disk Restore functionality was introduced allowing you to restore single VHDX or VMDK file from your backup set. Thereby this could save you a lot of time on your restore operations especially if you just need a single small virtual disk.
In order to restore a single disk, you can do so by navigating to the Granular Restore menu and then choose the Virtual Disk Restore option.
Then simply go through the process - as you would for a normal restore operation, however you will be presented with a choice to choose which VHDX/VMDK you wish to restore from your VM.
Note: Only backups taken with 7.5.6 and onwards can use the Virtual Disk Restore functionality.