I have been using Free Oracle Virtual Box since quite a while and I take back up of the hard disk file (Lucid Lynx.vdi) regularly so that I don’t loose any installation and configuration I have done in Ubuntu in case of any OS crash.
Host OS :- Windows XP
Guest OS :- Ubuntu 10.04
1.Install the Guest Additions. (Make sure from command line that its successful )
2.Share a windows folder at Settings –> “Shared folders ” -> Add machine folder eg. “dev” as name and path D:dev
3.Boot the guest OS and go to terminal
4 make folder to be the destination of the mount mkdir ~host
5. sudo mount -t vboxsf dev ~/host
6.For mounting automatically everytime you boot add the above line at /etc/rc.local
Now the folder ~host gives me access to all the contents of D:dev directory in windows drive.