Backup, VirtualBox, what else?
Improving performance of the Virtual Machine using this tip
When virtualising a Datto backup, the system has already had Virtualbox drivers installed, and will detect and install these. However it may also want to install a disk driver for the Intel chipset and fail to find this driver. Point it to C:\Windows\System32\Drivers (or SysWow64 perhaps) and it should find the right driver. This is essential for performance of the virtual machine.