You can use live ubuntu / fedora / centos cd OR usb to run dd command.
once you have boot using live cd, you can mount nfs partition OR use external usb hdd to store raw file being generated using dd command.
dd is probably easiest way to migrate physical machine to virtualbox.
Same as physical to kvm migration here we have used dd command.
dd if=/dev/sda of=hdd.img
Once hdd.img is ready, you can convert & compress tobe used for Virtualbox using following command.
cd c:\program files\oracle\virtualbox vboxmanage.exe convertfromraw hdd.img hdd.vdi
Above generated hdd.vdi can be used to create new vm on virtualbox.
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